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The Strangest Moon In the Solar System

StartsWithABang writes Moons in our Solar System — at least the ones that formed along with the planets — all revolve counterclockwise around their planetary parents, with roughly uniform surfaces orbiting in the same plane as their other moons and rings. Yet one of Saturn's moon's, Iapetus, is unique, with a giant equatorial ridge, an orbital plane that doesn't line up, and one half that's five times brighter than the other. While the first two are still mysteries, the last one has finally been solved.

141 comments

  1. That's no moon! by Anonymous Coward · · Score: 0

    It's an alien observation post. Duck blind, my ass! Those clowns say they have a Prime Directive, but it doesn't prohibit spying on other solar systems.

    1. Re:That's no moon! by Applehu+Akbar · · Score: 4, Funny

      They promise to only look at our metadata, not the content of our cell calls and digital pictures.

    2. Re:That's no moon! by Immerman · · Score: 2

      Actually that's a mistranslation, it should be:
      They promise to only look at our metadata, not the content of our glial cells and mental pictures.

      --
      --- Most topics have many sides worth arguing, allow me to take one opposite you.
  2. Medium. by Anonymous Coward · · Score: 5, Informative

    Linking to Medium is the new linking to LiveJournal.

    1. Re:Medium. by TWX · · Score: 4, Insightful

      I guess the people that used to read Time Magazine and Readers' Digest are the new target audience of Slashdot.

      After all, we could have links to scientific papers or at least their abstracts written by actual scientists who studied the phenomena.

      --
      Do not look into laser with remaining eye.
    2. Re:Medium. by ColdWetDog · · Score: 1

      TL;DR

      Besides, it's PICTURES!

      --
      Faster! Faster! Faster would be better!
    3. Re:Medium. by Anonymous Coward · · Score: 2, Informative

      How appropriate that this is the Starts with a Bang blog: way too many sentences in the postings on this site end with a bang.

      ... one half of Iapetus is only about one-fifth as bright as the other!

      But one of them has!

      ... density of about seven dust-sized grains per cubic kilometer!

      ... and finally know why it has a yin-yang coloration unlike anything else!

      Zowie! Boom! Kablooie!

      These articles read like a comic book. When I'm looking for scientific details, the style of these articles is really offputting.

    4. Re:Medium. by Anonymous Coward · · Score: 1

      Yet another reason to put a tax on the exclamation point.

    5. Re:Medium. by ncc74656 · · Score: 2

      Besides, it's PICTURES!

      ...and text 2-3x larger than it needs to be. Had to press Ctrl-- a few times to get it back down to roughly what every other website uses. Are they writing for the semi-blind?

      --
      20 January 2017: the End of an Error.
  3. Counterclockwise? by Anonymous Coward · · Score: 1, Insightful

    Viewed from which side? Counterclockwise does not apply here.

    1. Re:Counterclockwise? by Keramos · · Score: 3, Informative

      Viewed from which side? Counterclockwise does not apply here.

      Viewed when looking down from the north pole. This is mentioned in TFA, per

      Rather that [sic] (looking down from the north pole) orbiting counterclockwise around its parent planet, which all the other moons do, Phoebe revolves clockwise around Saturn.

    2. Re:Counterclockwise? by Anonymous Coward · · Score: 1

      But which way is north?

    3. Re:Counterclockwise? by RabidReindeer · · Score: 1

      Viewed from which side? Counterclockwise does not apply here.

      Almost planets and their moons orbit in, or closely aligned to a single plane (the ecliptic). Looking "down" (from the North) on a tangent to that plane, the planets and satellites will be seen to be rotating clockwise as most of their axes are also more or less perpendicular to that plane.

    4. Re:Counterclockwise? by Anonymous Coward · · Score: 0

      Wait? Which north pole? Earth's north pole doesn't seem like it applies.
      The Saturn's north pole? How do you decide which one is which? Without a magnetic field you have only the rotation to go on.

    5. Re:Counterclockwise? by Anonymous Coward · · Score: 1

      But which way is north?

      Up

    6. Re:Counterclockwise? by Anonymous Coward · · Score: 0

      No, Up would be radial+, North is clearly normal+

    7. Re:Counterclockwise? by Anonymous Coward · · Score: 1

      The planets are all in more or less the same plane, so the concept of north is meaningful throughout the system.

    8. Re:Counterclockwise? by lisaparratt · · Score: 1

      Convenient that Saturn has a magnetic field, then.

    9. Re:Counterclockwise? by Sique · · Score: 5, Informative

      The only planet whose north pole is not on the same side of the Ecliptic as the Earth's north pole is Uranus. In Uranus' case, the north pole is nearly in the Ecliptic itself, tilted at 98. All the other planets have their rotation axis (axial tilt) either nearly vertical to their orbit plane (e.g. Mercury, Venus, Jupiter), or tilted at about 20-30 (Earth, Mars, Saturn, Neptune).

      --
      .sig: Sique *sigh*
    10. Re:Counterclockwise? by Sique · · Score: 1

      Oh, Slashdot ate my degree sign.

      --
      .sig: Sique *sigh*
    11. Re:Counterclockwise? by rwa2 · · Score: 2

      Yes, agreed for most planets... but what about Uranus?

      (serious question, since it rotates sideways on its axis)

    12. Re:Counterclockwise? by Anonymous Coward · · Score: 0

      Just envision that you're looking down into the toilet bowl. Well unless you're in Australia where it spins anticlockwise when you flush. In that case, envision that you're underneath the toilet bowl looking up!

    13. Re:Counterclockwise? by mister_playboy · · Score: 2

      The only planet whose north pole is not on the same side of the Ecliptic as the Earth's north pole is Uranus.

      Venus's axial tilt is 177 degrees, that's about "not on the same side of the Ecliptic" as it could be.

      --
      Do what thou wilt shall be the whole of the Law ::: Love is the law, love under will
    14. Re:Counterclockwise? by Mariner28 · · Score: 2

      I was going to say that since all planets (and most moons) with the exception of Uranus have their rotational axis all lined approximately the same way as Earth, that the north pole could be defined as the same as earth: the pole from which the planet seems to be rotating counter-clockwise (or anti-clockwise for you Brits).

      But there's a glaring exception to that rule: Venus rotates in the opposite direction - clockwise from its "northern" pole. The leading theory is, like Earth, Venus was struck by a large planetoid early in the solar system's history, but unlike Earth's moon, the planetoid was totally absorbed by Venus, i.e., a direct hit. The angular momentum imparted by the planetoid caused Venus to "flip". The same theory has been proposed for Uranus' sideways orientation as well.

      --
      "A little misunderstanding? Galileo and the Pope had a little misunderstanding."
    15. Re:Counterclockwise? by Anonymous Coward · · Score: 0

      MOON. heh heh.

      URANUS huh huh.

    16. Re:Counterclockwise? by rossdee · · Score: 1

      Australia isn't the only place in the southern hemisphere

    17. Re:Counterclockwise? by tylersoze · · Score: 3, Informative

      Or just use the right hand rule :) Where "north" is by definition the positive direction of the total angular momentum pseudo-vector of the solar system.

    18. Re:Counterclockwise? by Convector · · Score: 4, Interesting

      According to the IAU definition, the north pole for a major planet (or one of its satellites) is the pole on the same side of the ecliptic as the Earth's north pole, the North Celestial Hemisphere. By this definition, Venus and Uranus are retrograde rotators -- they rotate clockwise about their north poles.

      For comets and minor planets (including Dwarf planets), the north pole is the pole about which the body rotates counterclockwise. So the north pole of a retrograde-rotating asteroid points into the South Celestial Hemisphere.

      This brings us (as do all topics that mention the IAU) to Pluto. Pluto rotates retrograde. It was once considered a major planet, so it's north pole would have been on the same side of the ecliptic as ours. But as a dwarf planet, the opposite definition applies. Even before the 2006 decision, the convention was inconsistently applied. Papers have been published using each definition of the north pole, and they're not always good about stating which convention they used. With New Horizons on the doorstep, we're going to need consistency for mapping and navigation. So I believe the mission has decided to use the current IAU definition consistently to avoid any confusion. There was a huge fight over the coordinate system of Vesta on the Dawn mission, and we don't want that.

    19. Re:Counterclockwise? by Will.Woodhull · · Score: 2

      "North" is a geocentric concept that can be projected outward upon the solar system.

      That one is simple and easy since there is a clear consensus among Earth dwellers as to which way is north.

      In other situations it can get more complicated, such as when projecting the egocentric concept of "Left" and "Right" outward from an individual point of view. The simplest case is when looking at a photo of Mutt and Jeff, and being told that Mutt is on the left. Even though when the photo was taken both Jeff would have said that Mutt was on his right side.

      There are even greater problems when there is no consensus within the group. For instance, for a libtard "going to the Left" is definitely right, but "going to the Right" is clearly wrong, which is as succinct a summary of the state of USA politics as you can get. Well, except for the die hard Tea Partiers, where "Right" is always right, and "Left" is always wrong. But then after rejecting everything that is not right, all the Tea Partiers have left is right. Which is at best terribly confusing.

      It was all so much simpler during the last American civil war, when everything was either North or South.

      --
      Will
    20. Re:Counterclockwise? by Anonymous Coward · · Score: 0

      Yet its north pole is still on the same side of the ecliptic just as the previous poster said. North pole of planets is defined relative to Earth's definition, regardless of the direction of their spin, with Uranus being the only odd one.

    21. Re:Counterclockwise? by rubycodez · · Score: 4, Informative

      Towards Polaris, and in fact that gives the direction of "galactic north" too. Note due to precession of Earth's axis after 3000 AD Gamma Cephei will become the pole star, and Iota Cephei in 5200 AD. Thuban was the pole star in 3000 B.C. Polaris will again become the pole star about 27,800AD

    22. Re:Counterclockwise? by surd1618 · · Score: 1

      This is all very northern-hemisphere-centric reasoning. Some day South Africa will be running the show, and you can bet that the moon will revolve clockwise.

    23. Re:Counterclockwise? by Anonymous Coward · · Score: 0

      "Down" is also meaningless in this context.

    24. Re:Counterclockwise? by Anonymous Coward · · Score: 0

      OK. Place in the southern hemisphere with indoor plumbing.

    25. Re:Counterclockwise? by Anonymous Coward · · Score: 0

      North pole of planets is defined relative to Earth's definition

      If that's the case, then it's good manner to attach your reply to the first post of the thread that made the mistake; in this case your grand-parent, who said that Uranus' north pole is not on the same side of the Ecliptic as the Earth's.

    26. Re:Counterclockwise? by Anonymous Coward · · Score: 0

      The grandparent of that post correctly said that the Uranus has a north pole practically in the elliptic (which pole is called north isn't always consistent with the IAU definition). However, there has been no inconsistencies with the labeling of Venus' north pole, and it points in the same direction above the elliptic, which is why that post was made in reply to the post about Venus suggesting it points in the opposite direction.

    27. Re:Counterclockwise? by Coren22 · · Score: 1

      Down is pretty consistent as it is always towards the center of gravity.

      --
      APK likes to ask for responses to the same things over and over. Maybe he just likes the responses?
    28. Re:Counterclockwise? by Anonymous Coward · · Score: 0

      Just the only one with flush toilets.

    29. Re:Counterclockwise? by Krishnoid · · Score: 1

      The angular momentum imparted by the planetoid caused Venus to "flip".

      Wouldn't it keep rotating? Why would it flip end-to-end and then stop?

    30. Re:Counterclockwise? by Anonymous Coward · · Score: 0

      Hahahahahaha @ Coren22 http://slashdot.org/comments.p...

    31. Re:Counterclockwise? by Anonymous Coward · · Score: 0

      just the only one that matters

      oh almost forgot "!"

    32. Re: Counterclockwise? by Anonymous Coward · · Score: 0

      Thank you. That really stuck out. How "nortern-hemispere"...

    33. Re:Counterclockwise? by Mariner28 · · Score: 1

      Same thing that keeps a gyroscope standing on end - conservation of angular momentum. Once an external force stops pushing one end of a gyroscope (or a colliding body hits Venus but is just about completely absorbed by it), the gyroscope stabilizes - albeit with a bit an precession (as mentioned in an earlier post about the precession of Earth's north pole).

      --
      "A little misunderstanding? Galileo and the Pope had a little misunderstanding."
    34. Re:Counterclockwise? by Anonymous Coward · · Score: 0

      I think I love you

  4. Medium site full of cloudfront trackers by Anonymous Coward · · Score: 1

    Every single hash-laden cloudfront link is a tracker. No thanks, Medium.

  5. The strangest moon in the solar system is ours. by Eunuchswear · · Score: 5, Informative

    It's HUGE.

    --
    Watch this Heartland Institute video
    1. Re:The strangest moon in the solar system is ours. by Neil+Boekend · · Score: 1

      It's not a moon so it doesn't count.

      --
      Well, I might have a way, but it only works on a semi spherical planet in a vacuum.
    2. Re:The strangest moon in the solar system is ours. by Eunuchswear · · Score: 1

      Our moon is not a moon? Sorry?

      (BTW I know that there are bigger moons than ours, but they're moons of Jupiter FFS).

      --
      Watch this Heartland Institute video
    3. Re:The strangest moon in the solar system is ours. by Anonymous Coward · · Score: 1

      It was a Star Wars IV reference/joke.

    4. Re:The strangest moon in the solar system is ours. by Mike+O'Hara · · Score: 0

      Our moon is not a moon? Sorry?

      (BTW I know that there are bigger moons than ours, but they're moons of Jupiter FFS).

      Depends how you interpret the IAU's 2006 definition of a planet. Earth's moon can be considered a planet in it's own right.

      --
      [FUCK BETA]
    5. Re:The strangest moon in the solar system is ours. by Sique · · Score: 1

      It is not as it doesn't dominate its orbit around the Sun (this orbit is dominated by Earth).

      --
      .sig: Sique *sigh*
    6. Re:The strangest moon in the solar system is ours. by Sique · · Score: 2

      Actually, Saturn also has a moon that is larger than Earth's Moon, Titan. Albeit the largest moon of Neptune, Triton, misses the size of Earth's Moon by about 200 km of radius.

      --
      .sig: Sique *sigh*
    7. Re:The strangest moon in the solar system is ours. by Anonymous Coward · · Score: 0

      There's also Jupiter's major moons. Ganymede is roughly twice the mass of Luna.

    8. Re:The strangest moon in the solar system is ours. by Anonymous Coward · · Score: 0

      Dual planets.

      Both planets are planets, neither clear their orbits.

      It's in the IAU definitions.

      Technically, the moon isn't *yet* a planet, but will be in a few millions of years.

    9. Re:The strangest moon in the solar system is ours. by Anonymous Coward · · Score: 0

      How about the definition that it's means it is? How can you not know that?

    10. Re:The strangest moon in the solar system is ours. by MozeeToby · · Score: 2

      I'm not sure why you're modded funny. The relative sizes of the Earth/Moon system is a total anomaly, so much so that it is very very close to the point where you have to call them a double planet rather than a planet and moon.

    11. Re:The strangest moon in the solar system is ours. by Eunuchswear · · Score: 4, Interesting

      There is also the bizzare coincidence that the size of our moon, viewed from the earth is almost exactlty the same as the sun, viewed from the earth -- hence total eclipses of the sun.

      --
      Watch this Heartland Institute video
    12. Re:The strangest moon in the solar system is ours. by Will.Woodhull · · Score: 1

      That's no moon; that's half a binary planet.

      --
      Will
    13. Re:The strangest moon in the solar system is ours. by houghi · · Score: 1

      obb: I don't think that's a moon.

      --
      Don't fight for your country, if your country does not fight for you.
    14. Re:The strangest moon in the solar system is ours. by Anonymous Coward · · Score: 2, Insightful

      Technically, the moon isn't *yet* a planet, but will be in a few millions of years.

      There is no "technically" in this case, as there is no formal definition of a double planet. Some people think the barycenter moving above the surface is the definition of a double planet, but that is in no way formal or "technically." Plenty of astronomers think that definition is not very useful, because changing distance between two bodies can always move the barycenter out of the surface of the larger one, while not changing the dynamics in any qualitative way. Jupiter already moves the barycenter of the solar system out of the Sun. Given the current objects known in the solar system though, there is no need for a formal definition of a double planet, because there is no need to specify such a category when naming one or two examples is enough.

    15. Re:The strangest moon in the solar system is ours. by Anonymous Coward · · Score: 0

      so much so that it is very very close to the point where you have to call them a double planet rather than a planet and moon..

      There is no "point" where you could call them a double planet. You could call them a double planet now, or you could not refer to it as a double planet when they separate any more. It is a vague term with no specific or consistently applied definition in astronomy.

    16. Re:The strangest moon in the solar system is ours. by aaron4801 · · Score: 2

      The barycenter of the Earth-Moon system lies inside the Earth. Contrast that with the Pluto-Charon system where that point lies between the bodies, and the difference between a planet/moon and a dual planet becomes clear.

    17. Re:The strangest moon in the solar system is ours. by Anonymous Coward · · Score: 2, Insightful

      The moon has been receding from the earth since its creation. The coincidence is that we are here to observe the moon during the time when the visual sizes are so similar.

    18. Re:The strangest moon in the solar system is ours. by Camel+Pilot · · Score: 1

      Coincidence eh? Or is it that God wanted us to explore our world...

      "The Moon is unique in the solar system in its large relative size compared with the Earth. The Moon appears from the Earth to be the same size as the sun, in perfect artistic symmetry, unlike any known other planet-moon system. [...] To many Christians, these characteristics appear as "clues" or "hints" left by God for men to discover. [...] The Moon appears to have the same size as the Sun when viewed from Earth. This creates a unique symmetry and phenomenal solar eclipses. The odds of this occurring by chance are nearly zero"

      Conservapedia

    19. Re:The strangest moon in the solar system is ours. by Anonymous Coward · · Score: 0

      Not sure how one would assign probability for one off things with uncertain details origins (even in a Bayesian framework), but considering total solar eclipses were possible for about half a billion years before and after today, that is a pretty sizable chunk of Earth's history. Earth's and the Moon's elliptical orbits give some flexibility in sizes, which isn't "perfect" considering you can have annular eclipses still too.

    20. Re:The strangest moon in the solar system is ours. by Anonymous Coward · · Score: 0

      Can't argue with a belief, since a belief can exist with utterly no evidence.

    21. Re:The strangest moon in the solar system is ours. by geantvert · · Score: 1

      You should only make jokes about episodes I, II and III.

    22. Re:The strangest moon in the solar system is ours. by geantvert · · Score: 1

      The problem with those events with a small probability is that there are so many of them that a few will always occur. It's like saying that god is responsible for the lottery winner because the probability of each player is very low.

    23. Re:The strangest moon in the solar system is ours. by Anonymous Coward · · Score: 0

      I thought those episodes were the joke?

    24. Re:The strangest moon in the solar system is ours. by dave420 · · Score: 1

      That's only temporary. The moon is receding, and so the total eclipses won't last forever.

    25. Re:The strangest moon in the solar system is ours. by Blaskowicz · · Score: 1

      There is a possibility a large moon is necessary for intelligent life, or at the least the strong tides (really huge at the beginning) were helpful in stirring things up for the appearance of dumb life.

    26. Re:The strangest moon in the solar system is ours. by RockDoctor · · Score: 1

      The relative sizes of the Earth/Moon system is a total anomaly,

      Is it? Moon diameter is 0.2724 that of Earth ; Charon's diameter is 0.5050 that of Pluto. For masses the corresponding ratios are 0.0122 (1/81) and 0.1160 (1/9). so, is the Moon a "total anomaly"?

      so much so that it is very very close to the point where you have to call them a double planet rather than a planet and moon.

      I've been taking an interest in astronomy for 40 odd years now, and I don't know what the point where I'd "have to" call a system a "double planet" is. I don't recall ever seeing the term defined in the astronomical literature. Even Wikipedia puts it as no stronger than an "informal term".

      What would be the benefit of such a term? Once you acknowledge that two objects are in an orbital relationship, you need to calculate various properties (mutual eccentricities, velocities, masses, periods), but these are going to be essentially the same calculations whether you're looking at Pluto-Charon or Pluto-Nix (or is it Hydra that's the smallest known component of that system?). It's only when systems are close enough that they become tidally-locked that you get something new happening. Until the atmospheres meet. It's the same situation for multiple stars too - until you have to account for mass transfers from one to the other, then you're still looking at a Keplerian system.

      --
      Birds are not dinosaur descendants;birds are dinosaurs, for all useful meanings of "birds", "are" and "dinosaurs"
    27. Re:The strangest moon in the solar system is ours. by RockDoctor · · Score: 1

      There is a possibility a large moon is necessary for intelligent life,

      It's a possibility. It attracts a fair amount of discussion. With a sample size of 1, we have no way of assessing whether or not it's a true statement. It is just as likely that the development of life, and intelligence, are completely unrelated to the presence of a medium-size moon.

      --
      Birds are not dinosaur descendants;birds are dinosaurs, for all useful meanings of "birds", "are" and "dinosaurs"
    28. Re:The strangest moon in the solar system is ours. by cwsumner · · Score: 1

      Our moon is not a moon? Sorry? ...

      The Earth's "moon" is not a moon, the Earth-Moon system is a double planet. At no point does the Moon's orbit actually curve away from the Sun, it always curves toward the Sun. As it goes on the "inside" of the orbit it flattens out, but does not curve away from the Sun.

      In other words, the moon is influenced more by the Sun's gravity, than the Earth's gravity.

    29. Re:The strangest moon in the solar system is ours. by Anonymous Coward · · Score: 0

      The orbital path the moon takes would not be much different if it were a tiny chunk of rock (yes, the barycenter is not at the center of the Earth, but the difference is a small percent of the orbital radius). A definition of double planet that isn't influenced by the size of the second object seems rather asinine.

      And while the pull of the Sun's gravity on the Moon is twice that of Earth's, the gradient in the Sun's gravity over the Moon's orbit is only about 1%, so of course Earth's gravity well is dominating that. Whereas the pull of the Moon on the Earth is less than that of the gradient in Sun's gravity. But if you want to just stick to the criterion that the Sun's pull is stronger than the planet's, that also applies to a moon of Jupiter and two tiny moons of Neptune.

  6. Unique? by stjobe · · Score: 5, Insightful

    Yet one of Saturn's moon's, Iapetus, is unique

    Aren't they all unique?

    --
    "Total destruction the only solution" - Bob Marley
    1. Re:Unique? by Keramos · · Score: 5, Funny

      Yet one of Saturn's moon's, Iapetus, is unique

      Aren't they all unique?

      Yes, and they're all special too.
      And they can grow up to be any kind of planet they want.

      AS LONG AS IT'S A DWARF PLANET, RIGHT PLUTO? HA HA HA, LOSER!

    2. Re:Unique? by Anonymous Coward · · Score: 0

      Having just defined properties shared by all the other moons except Iapetus, the terms of it's uniqueness should be fairly apparent. The uniqueness of a thing is rarely if ever defined in absolute terms, otherwise there would be few things in the universe to which the word did not apply. Rather a thing is said to be unique when it has shared properties that make it unarguably part of a group of other objects, and yet differs on notable properties that all other members of the group share. That does not mean that all other members of the group are identical in every way.

    3. Re:Unique? by Anonymous Coward · · Score: 0

      Everyone's a winner!

    4. Re:Unique? by Anonymous Coward · · Score: 1

      No, only Iapetus is unique. All the other moons are the same, but Iapetus isn't. That's the one thing that makes it different from the rest.

    5. Re:Unique? by NoNonAlphaCharsHere · · Score: 1

      But our work isn't finished. Now that we've gotten Pluto kicked off the list of planets, we need to get fucking Plutonium off the Periodic Tale of Elements.

    6. Re:Unique? by Anonymous Coward · · Score: 0

      Yet one of Saturn's moon's, Iapetus, is unique

      Aren't they all unique?

      Yes, but what does that have to do with this article?

      Yet one of Saturn's moon's, Iapetus, is unique, with a giant equatorial ridge, an orbital plane that doesn't line up, and one half that's five times brighter than the other.

      Aren't they all unique?

      No, no other moon in our solar system matches those criteria.

      (I left your question in as a mis-quote in hopes you'll understand why claiming you said something you didn't, like you just did, is a bad thing)

    7. Re:Unique? by Keramos · · Score: 2

      I'm happy to compromise and leave plutonium there, as long as elements 119 and 120 aren't named Mickium and Donaldium. Although perhaps given the length of certain copyrights, those names might be appropriate if they happen to fall into the island of stability.

    8. Re:Unique? by Anonymous Coward · · Score: 0

      I'm happy to compromise and leave plutonium there, as long as elements 119 and 120 aren't named Mickium and Donaldium. Although perhaps given the length of certain copyrights, those names might be appropriate if they happen to fall into the island of stability.

      How about Goofium? The only other disney alternative isn't pretty. JarJarBinxium!

    9. Re:Unique? by Anonymous Coward · · Score: 0

      Periodic Tale of Elements.

      That story sucks, too repetitive.

  7. To summarize. by jellomizer · · Score: 2, Informative

    I found this article to be rather long winded in order to create a story with suspense.
    The moon has a side facing away from Saturn which is darker then the side facing saturn. It seems to be due to collecting dust from a larger ring that is on the border of its orbit.

    Done, saved you a long and pointless naritive.

    --
    If something is so important that you feel the need to post it on the internet... It probably isn't that important.
    1. Re:To summarize. by Anonymous Coward · · Score: 1

      in order to create a story with suspense

      Wikipedia: [Cassini] correctly deduced that Iapetus is locked in synchronous rotation about Saturn and that one side of Iapetus is darker than the other
      Medium: Iapetus, presented a tremendous mystery to Cassini.

    2. Re:To summarize. by Keramos · · Score: 5, Informative

      I found this article to be rather long winded in order to create a story with suspense. The moon has a side facing away from Saturn which is darker then the side facing saturn. It seems to be due to collecting dust from a larger ring that is on the border of its orbit.

      Done, saved you a long and pointless naritive.

      Actually, that's not quite correct. You've got two errors there, and missing the real mystery, although the article itself actually fails to explicitly specify what the solution is.

      The darker side is actually the leading hemisphere, not the far or outer side (from Saturn). Dust doesn't onto the far side, the moon plows through it in places, getting dust on the leading side. No mystery here for quite a while though - telescopes have been able to make out "the dark patterns look a lot like dust" for quite a while. The Phoebe ring itself was only detected about 10 years ago, but it was expected that dust was coming from the outer moons for a while.

      The thing is, if the only process happening was that dust was being swept up by Iapetus, then every time the dark side faced the Sun, the dark coating would heat up, cause the ice underneath it to sublime (think evaporate, if that doesn't mean anything - it's close enough) and freeze again over the dust, leaving behind a light surface again. But we see a dark surface. Why? Mystery!

      The solution (which the article doesn't really explain fully) is that initially dust from the ring caused ice to turn to gas, leaving behind a dark residue that we now see (and the Cassini probe has been able to measure), but instead of just floating around above the (relatively) warm, dark surface until it faces away from the Sun and cools down, much of the vapour refreezes on the light side as it passes over it due to the lower temperature there.

      The dark residue (not the original dust) now causes further heating each orbit, repeating the cycle. Over time, a large amount of ice from the leading side is being evaporated away, leaving that side to get darker and darker from the residue, with a certain amount of the ice migrating to the light side and refreezing (as light coloured ice) keeping it nice and bright.

      TLDR: Mystery! Dust doesn't explain the dark leading side of Iapetus! Ice would cover it in a shiny coat each orbit. Planetary detectives trace the culprit to dark residues left behind as heated ice moves to a new neighbourhood on the cooler side of the moon. More dark areas means more solar heating, and more ice migrating away in a self-perpetuating cycle. Mystery solved! Good job, planetary scientists!

    3. Re:To summarize. by NoNonAlphaCharsHere · · Score: 5, Funny

      Done, saved you a long and pointless narrative.

      Where were you for all those Bennett Hassleton articles?

    4. Re:To summarize. by Anonymous Coward · · Score: 0

      Dust doesn't explain the dark leading side of Iapetus!

      If dust explains how the dark side got bootstrapped, and if it's still falling at the same rate on Iapetus, then it does explain the dark side we see today. No convoluted explanation necessary.

    5. Re:To summarize. by CaptainLard · · Score: 1

      Wow, yeah science should never attempt to be interesting, especially for the lay audience. All of the longstanding questions, brilliant technological achievements, and research built on the shoulders of giants is completely worthless to talk about when all the had to tell us is "there's moving dust on it".

      In other news I wasted a whole 8 seconds reading that first sentence describing your unnecessary editorial opinion and post script. Your summary was twice as long as it needed to be.

      Seriously, 10 short large font paragraphs interspersed between amazingly detailed imagery is too much?

    6. Re:To summarize. by Will.Woodhull · · Score: 1

      The moon has a side facing away from Saturn which is darker then the side facing saturn. It seems to be due to collecting dust from a larger ring that is on the border of its orbit.

      You said that very succinctly. Unfortunately it is also very wrong.

      Read TFA again. The dark side (of Iapetus-- not the Force) is the side that is facing forward in its orbit.

      May the Farce be with you.

      --
      Will
    7. Re: To summarize. by Yakasha · · Score: 3, Insightful
      Here is a summary you can copy/paste for all hazelton articles:

      Derp!

    8. Re:To summarize. by Anonymous Coward · · Score: 0

      WELL

      Your explanation is fine, but someone is going to clean the place up, and it's NOT GOING TO BE ME.

    9. Re:To summarize. by Anonymous Coward · · Score: 0

      Does this mean that the light, trailing hemisphere - on which ice has accumulated through this process for millions of years - should have a detectably higher altitude than the dark, leading hemisphere?

    10. Re:To summarize. by RockDoctor · · Score: 1

      The one thing that I'd add is that the identification if the dark material on Iapetus as debris from the Pheobe ring was news in 2007.

      --
      Birds are not dinosaur descendants;birds are dinosaurs, for all useful meanings of "birds", "are" and "dinosaurs"
    11. Re:To summarize. by DRJlaw · · Score: 1

      Planetary detectives trace the culprit to dark residues left behind as heated ice moves to a new neighbourhood on the cooler side of the moon. More dark areas means more solar heating, and more ice migrating away in a self-perpetuating cycle. Mystery solved! Good job, planetary scientists!

      Interplanetary redlining and white flight! Bad job, scientists!

    12. Re:To summarize. by Anonymous Coward · · Score: 0

      OMG MYSTERY! What happened next? I think the butler did it.

  8. Iapetus... by Anonymous Coward · · Score: 0

    .. was the moon that the TMA sent its initial radio message to in the 2001 novel - for exactly the reasons given above, that it was an anomalous and curious object that could possibly have been artificial.

    For the film, Kubrick had decent pictures of Jupiter, but not Saturn, so the plot had to be changed to make the probe a Jupiter Probe.

    1. Re:Iapetus... by dpilot · · Score: 4, Interesting

      The fun is that in 2001, the bright side of Iapetus was sculpted, with the monolith in the middle. In reality the dark side is sculpted from passage through the dust ring.

      --
      The living have better things to do than to continue hating the dead.
  9. somebody has to say it... by Anonymous Coward · · Score: 0

    THAT'S NO MOON!!!

    1. Re:Somebody has to say it... by Anonymous Coward · · Score: 0

      THAT'S NO MOON!!!

      SAY IT AGAIN

    2. Re:Somebody has to say it... by peragrin · · Score: 1

      right it is a egg, of a space dinosaur.

      that is why it has a ridge.

      --
      i thought once I was found, but it was only a dream.
    3. Re:Somebody has to say it... by Anonymous Coward · · Score: 0

      THAT'S NO MOON!!!

      the way you say it makes it sound like a jj abrams reboot of star wars episode iv.

    4. Re:Somebody has to say it... by hooiberg · · Score: 1

      It was a poor attempt at a Star Wars reference...

    5. Re:Somebody has to say it... by Painted · · Score: 1

      Actually, it's the embryonic stage of a Titan. Hopefully Iapetus will survive it's birth and not shatter into a second ring system...

      --
      http://marsandmore.com - Posters of space, spacecraft, and astronomy.
    6. Re:Somebody has to say it... by RockDoctor · · Score: 1

      Why people bother with Star Wars references remains beyond me. Like - it was a movie in the 1970s or so, with an unending stream of sequels and prequels and reboots and regurgitations. Do people still watch these things? If I wanted an unending sequences of prequels and reboots, I'd watch a Bond movie.

      --
      Birds are not dinosaur descendants;birds are dinosaurs, for all useful meanings of "birds", "are" and "dinosaurs"
    7. Re:Somebody has to say it... by hooiberg · · Score: 1

      It is the same as people who keep shouting 'oh my gawdd', while that is just a very old-fashioned book from about two thousand years ago. Some things just make it into classics.

  10. Somebody has to say it... by hooiberg · · Score: 0

    THAT'S NO MOON!!!

  11. What a hideous annoying website medium.com is by Anonymous Coward · · Score: 5, Insightful

    We aren't all using tablets or phones. Looks like crap on my laptop.

    As for the article, if you are going to casually use words like "sublimate" without definition, it means your target audience is sophisticated enough that you don't need to write using a breathless, made for reality TV, annoyingly *excited* tone.

    1. Re:What a hideous annoying website medium.com is by Anonymous Coward · · Score: 0

      Pretty safe to assume that most people even remotely interested in this article know what sublimate means. Same crowd used to play with dry ice as kids.

    2. Re:What a hideous annoying website medium.com is by chihowa · · Score: 1

      Pretty safe to assume that most people who were capable of reading the first clause of that sentence could also read the second clause and understood the point he was making.

      ...it means your target audience is sophisticated enough that you don't need to write using a breathless, made for reality TV, annoyingly *excited* tone.

      --
      If you want a vision of the future, imagine a youtube comments section scrolling - forever.
    3. Re:What a hideous annoying website medium.com is by Anonymous Coward · · Score: 0

      Autism.

  12. The Ridge by Viol8 · · Score: 4, Interesting

    POssibly the moon is formed from 2 bodies colliding and before it could completely settle down into a round shape it froze with that ridge remaining?

  13. mindblowing by dingleberrie · · Score: 4, Funny

    Dude... Do you think that when Pink Floyd sang about the Dark side of the moon, they were really talking about Iapetus?

    1. Re:mindblowing by wonkey_monkey · · Score: 1

      I don't know, but I heard that all of Bennett Haselton's submissions sync up with it.

      --
      systemd is Roko's Basilisk.
    2. Re:mindblowing by Mariner28 · · Score: 1

      Not when the MGM lion roars, but when Katy Perry roars. BH is a closet Katy Perry fan.

      --
      "A little misunderstanding? Galileo and the Pope had a little misunderstanding."
    3. Re:mindblowing by Anonymous Coward · · Score: 0

      What did Muad'dib say to Roger Waters ?

      I'll see you on the marked side of the Dune.

  14. yay hype by Anonymous Coward · · Score: 1

    and unreadable hipster websites

  15. Re:To summarize the summary by rwa2 · · Score: 1

    This!
    By all means ignore the GP post and RTFA. Lots of cool pictures and chat about how Phoebe is special and how ridges from old impact craters on Iapetus are really old.

    Unless you're not all that into space stuff... then I'd understand if you might find TFA "long-winded" and would probably appreciate having more time for reading buzzfeed "articles".

  16. So let me get this straight... by Anonymous Coward · · Score: 0

    Iapetus keeps slamming into Phoebe's dirty ring.

    Has NASA been bought out by redtube?

  17. OMG by Anonymous Coward · · Score: 0

    Is it just me that looked at the 5th picture in the article and thought:
    "OMG it's a brown Death Star"?

  18. The Strangest Moon by Anonymous Coward · · Score: 1

    was Kieth.

  19. Re: The strangest moon in the solar system is ours by Anonymous Coward · · Score: 0

    The size of the moon relative to the Earth is, however, quite unusual to say the least.

  20. Re:Serious question for you by Anonymous Coward · · Score: 0

    Did you not understand, not see, not care? What?

    Probably more than you did. "More or less" does not answer the question regarding Uranus and it is still a valid concern.
    The previous post made the claim that Earths north pole was the reference used to indicate the north pole of the rest of the planet, but this doesn't help us determine the north pole of Uranus, nor does it apply to planets outside the solar system unless that system is oriented in the same direction as our system.
    Essentially the answer was a bad answer that didn't address the fundamental question. It is completely reasonable to ask the question again.
    Your post is on the other hand a lot harder to defend.

  21. Fuck startswithabang by Anonymous Coward · · Score: 0

    and all his fucking exclamation points. That punctuation mark should only ever be used in works of fiction, and only in dialogue.

    1. Re:Fuck startswithabang by Anonymous Coward · · Score: 0

      and all his fucking exclamation points. That punctuation mark should only ever be used in works of fiction, and only in dialogue.

      Yes, it is like he saw a double rainbow or something!

  22. Re:Serious question for you by Anonymous Coward · · Score: 0

    ""More or less" does not answer the question regarding Uranus"

    Yes it does.

    It's one of the ones that does not adhere to the same orientation of all the others, therefore it's not the majority. If it's not the majority, then a claim defining "north" as the north of the majority definition of north is not countered by a claim of a minority position existing.

    I REALLY would have thought that you dumbasses ***IN A FUCKING DEMOCRACY*** would be able to comprehend the idea of "majority decision".

    FFS.

  23. Nope by Theaetetus · · Score: 1

    POssibly the moon is formed from 2 bodies colliding and before it could completely settle down into a round shape it froze with that ridge remaining?

    Nah, it's clearly an equatorial mass driver that was covered over with rock to keep it safe from meteorites.

  24. Its a well camoflaged space ship... by Anonymous Coward · · Score: 0

    named Dahak.

    1. Re:Its a well camoflaged space ship... by cwsumner · · Score: 1

      named Dahak.

      That's true, but if you tell anyone else I will just claim I was kidding with you... 8-)

  25. Kubrick switched to Jupiter due to F/X ease by peter303 · · Score: 2

    In one of the books on the Making of 2001 Kubrick it was hard to obtain the F/X artisitc effect he wanted of Saturn and Iapetus, so he switched to a black-gate orbiting Jupiter. The movie and the book were co-made at the same time, mostly agreeing. Jupiter is one choice because its the second largest thing in the Solar System. Clark instread, chose something so odd, that could not be natural.

  26. You Can't HANDLE The Truth by Skip666Kent · · Score: 1, Funny

    It amazes me that so many allegedly "educated" people have fallen so quickly and so hard for a fraudulent fabrication of such laughable proportions. The very idea that a gigantic ball of rock happens to orbit our planet, showing itself in neat, four-week cycles -- with the same side facing us all the time -- is ludicrous. Furthermore, it is an insult to common sense and a damnable affront to intellectual honesty and integrity. That people actually believe it is evidence that the liberals have wrested the last vestiges of control of our public school system from decent, God-fearing Americans (as if any further evidence was needed! Daddy's Roommate? God Almighty!)

    Documentaries such as Enemy of the State have accurately portrayed the elaborate, byzantine network of surveillance satellites that the liberals have sent into space to spy on law-abiding Americans. Equipped with technology developed by Handgun Control, Inc., these satellites have the ability to detect firearms from hundreds of kilometers up. That's right, neighbors .. the next time you're out in the backyard exercising your Second Amendment rights, the liberals will see it! These satellites are sensitive enough to tell the difference between a Colt .45 and a .38 Special! And when they detect you with a firearm, their computers cross-reference the address to figure out your name, and then an enormous database housed at Berkeley is updated with information about you.

    Of course, this all works fine during the day, but what about at night? Even the liberals can't control the rotation of the Earth to prevent nightfall from setting in (only Joshua was able to ask for that particular favor!) That's where the "moon" comes in. Powered by nuclear reactors, the "moon" is nothing more than an enormous balloon, emitting trillions of candlepower of gun-revealing light. Piloted by key members of the liberal community, the "moon" is strategically moved across the country, pointing out those who dare to make use of their God-given rights at night!

    Yes, I know this probably sounds paranoid and preposterous, but consider this. Despite what the revisionist historians tell you, there is no mention of the "moon" anywhere in literature or historical documents -- anywhere -- before 1950. That is when it was initially launched. When President Josef Kennedy, at the State of the Union address, proclaimed "We choose to go to the moon", he may as well have said "We choose to go to the weather balloon." The subsequent faking of a "moon" landing on national TV was the first step in a long history of the erosion of our constitutional rights by leftists in this country. No longer can we hide from our government when the sun goes down.

    --
    **>>BELCH
  27. Equatorial Ridge by Aereus · · Score: 1

    My armchair theory for the ridge would be it wasn't always tidally locked, and plowed through a significant amount of debris material along that plane originally. Eventually becoming tidally locked, and the larger particulate had been mostly thinned out. And the tilt happening as the rotation failed, much like a top wobbles and falls over after losing momentum.

  28. Grammar by TimSSG · · Score: 1

    This is wrong "Moons in our Solar System" should be either "Moons in the Solar System" or "Moons in our star system". I hate reading Sci-Fi books that has multiple solar systems in our galaxy. Tim S.

    1. Re:Grammar by Anonymous Coward · · Score: 0

      Don't get me started, I hate reading books and news stories that talk about geysers, when everyone knows there is only one Geysir, and it is in Iceland.

    2. Re:Grammar by geantvert · · Score: 1

      Even the NASA does not agree with you "A solar system refers to a star and all the objects that travel in orbit around it. ..."
      https://solarsystem.nasa.gov/p...

      If one day humans reach other solar or if you prefer star systems, then they likely will keep using the terms solar and sun to refer to their local star. A solar panel will never be renamed to something like an Alpha Canis Minoris panel.

    3. Re:Grammar by Anonymous Coward · · Score: 0

      ...but it could be renamed to a stellar panel...

  29. Re: The strangest moon in the solar system is ours by Gavagai80 · · Score: 1

    Considering Venus the only other planet sized similarly to Earth in this solar system, and that we don't know of any exomoons yet, it seems premature to declare it that unusual.

    --
    This space intentionally left blank
  30. Re: The strangest moon in the solar system is ours by AntiSol · · Score: 1

    Indeed.

    This makes me think of "Foundation and Earth" by Isaac Asimov.

    ~30,000 years in the future, and they're looking for the mythical homeworld of humanity, known as "Earth".

    But the legends about the huge moon and the gas giant with a huge ring system are obviously just legends, exaggerated over the milennia, and should not be taken seriously...