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Lake spotted on Titan?
jahead writes "It looks like
a lake has been seen on Saturn's moon Titan by the Cassini probe. But don't get too excited yet. As mentioned by Elizabeth Turtle in the article, it could also be a dried up lake that left dark deposits."
What do you moderators not understand about "I'm not trolling, I'm curious."? I'm looking for more knowledgeable people in the Slashdot community to answer the question of the finding's significance. It's one thing to find something, and report it, but TFA gives no reason as to why this is important. Does it allow for future bases on Titan to somehow suck up methane for fuel? Is there the possibilty of methane-based life that might live in a methane lake? I'd like to know why this is important.
libertarianswag.com
I think the major thing of interest here is that Titan is so different to any body in our solar system (other than Earth, of course). The fact that liquid of any kind exists is quite remarkable. It means it has been able to retain pretty much all of it's initial components, unlike most other rocky bodies that heat up and lose a lot of their original constituents. Titan is, I believe, a kind of mini proto-planet. It's similar to how Earth would've been when it was young. The difference, however, is that Earth was in a position to heat up and eveolve, whereas Titan is perpetually frozen. There's a lot of fascinating science there.
As for methane-based life, I think it's unlikely just because of the extraordinarily low temperatures on there.
From my limited astronomy background (wasn't my major, but it fascinated me so I paid attention): Through modeling, we can assume that what holds on Earth, should hold on other planets, other galaxies etc.
I think what we are forgeting is that it seems that we know less about space than sometimes we think. For example, if memory serves me right, there is a lot of dark matter in the fringes of the galaxy- we know it is there because something is having an effect on other bodies there, however we can't detect it because it doesn't seem to emit any known energy source... (Caveat- I am not an astronomer, just a hobbyist, so take my assertion with a salt grain)
So in my line of reasoning, it seems that this lake on Titan may not have the same characteristics as a similar lake on Earth, for a plethora of reasons that we may not understand yet.
All that aside, how cool would it be to swim on another planet, even if in a lake of methane...
And for those with tinfoil hats- keep in mind that some assume that we don't get real info from NASA- such as those who say that gravity on the moon is much closer to the Earth's gravity, unlike what we are told, but this can't be released because it would throw a Geurilla Wrench into the theory of relativity....
And All I Ask is a Tall Ship And a Star to Steer Her By
Umm. . . No.
.something, and that's about it for the bodies in the solar system.
Io was the second known body to have liquids on its surface (1979 Voyager flybys discovered active, extrusive volcanism). Titan was next, though we couldn't see through the clouds, so we had no idea. Triton was the fourth to possibly have liquids on its surface, though we still don't know for sure. Venus also likely has some liquid lava on its surface, though we've not seen actual volcanism. Plus, Venus probably sometimes has sulfuric acid rains, but we're not sure. Mars may also have transient liquids on its surface.
Titan's cool because it's probably got an active hydrologic cycle (don't read hydro- to mean water, read it to mean fluid). Earth does, Venus might, Io has. . . something, Mars had one, it might still, occasionally. Triton has. .
Earth is a big body, so it still has radionuclide heat, and it's close to the sun, so it's got an abundance of energy to drive a hydrologic cycle. We can't see through Venus' clouds with more than RADAR, so we don't know what's going on there. Mars is small, so its heat has mostly left it, and it gets nearly 1/4 the energy the Earth gets from the sun, so it's cold and has little atmosphere left. Io is in a weird, slightly eccentric, orbital resonance, so its energy comes at the expense of Jupiter (and Ganymede and Europa). Titan's also in an eccentric orbit, but it doesn't have the resonance with other sats that Io has, so it "should" have lost most of its energy--one of the mysteries is why such a small body has such a huge atmosphere (and thus a hydrologic cycle). Triton might have a bit of an atmosphere, and why is also a mystery.
So, of the many, many bodies in the solar system, there are only a few that have atmospheres, and fewer that have an active, observable hydrologic cycle. . .