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First Exoplanet Atmospheres Analyzed
deblau writes "NASA's Spitzer Space Telescope has captured for the first time enough light from planets outside our solar system, known as exoplanets, to identify signatures of individual molecules in their atmospheres. The landmark achievement is a significant step toward being able to detect possible life on rocky exoplanets and comes years before astronomers had anticipated."
Shit! They are all polluted also.
Table-ized A.I.
The lack of water on these planets is interesting. While the articles indicate that the water may just be masked by higher atmospheric layers, one would think that there would be some water to be found.
.. paranoid crackpot leftover from the days of Amiga.
they just have to replace pluto as a planet so they dont have to change every textbook ever made
NASA's Spitzer Space Telescope has captured for the first time enough light from planets outside our solar system, known as exoplanets, to identify signatures of individual molecules in their atmospheres.
Jesus. If they can see that far out, imagine what they can see when they look straight down.
The theory of relativity doesn't work right in Arkansas.
... will be when we discover a planet with a huge hole in its ozone layer? :P
"The first time I got drunk, I got married. The second time I bought a chimpanzee, after that I stayed sober" Arian Seid
What will be really interesting will be to see how accurate their atmospheric analysis will be a year from now. In the article they mentioned finding tiny particles of "silicates in the atmosphere". Sounds a like a lot of speculation as to what the actual data could represent.
I've done the math, I know the odds, but I'm still disappointed when I don't win the lottery.
..."clean burning" should be defined. Natural gas burns clean in the way it doesn't produce NOx, SOx and so on, but it's made of carbon and hydrogen. So the burning of natural gas will produce CO2. Since CO2 is responsible for global warming (yes, i'm a believer), it's burning is not clean in my personal view.
I think we'd be more amazed to discover a planet with an ozone layer, period. Add a spun-iron-core magnetic field to it and we'd be ecstatic.
Ice Cream has no bones.
I think it is amazing how they can get the spectrum of the planet by substracting the spectrums of both using a formula like:
planet = (star + planet) - star
In other words, take the spectrum of both and compare it to the spectrum of the star when the planet is behind the star.
It seems to me the star's spectra would be so strong as to wash out anything from the planet. However, maybe the specific chemical signatures they are looking for are weak in the star. For example, stars are probably too hot for a water line. Water would probably be converted into fundimental elements by the star.
Table-ized A.I.
is a significant step toward being able to detect possible life
There has as yet been suprisingly very little research into the detection of inpossible life, blame underfunding for NASA.
Always back up, never back down. ---- Think you're cool 'cos your uid is prime? Take mine, modulo the one digit integers
Technically, Mars qualifies.
Table-ized A.I.
...are they full of stars?
Table-ized A.I.
All the extra solar planets that have been found so far are large gas giant type planets.
Our telescopes aren't good enough (yet) to detect small earth size rocky planets.
While spectographic analysis of these planets atmosphere is interesting, it does not give us information about the possiblity of life (as we know it, Jim) since these aren't the places we would find life in this solar system either. Maybe these other planetary systems do include rocky planets, or moons (like titan and europa ) that could be candidates for some form of life, but we wouldn't find that out by looking at the atmospheres of JUpiter and Saturn
...wrong thread, I'm sorry :(
Is it M-Class what?
Barring a signal that we can recognize as both extrasolar and artificial in origin, I'm afraid we're still going to have to go and look for ourselves if we want a definitive answer to the question of life "out there".
Until they can read a Starbucks sign there won't be proof of extrasolar geeks. I'd say reading a Red Bull can but that's probably asking too much.
Until we can read "life-signs"?
My eyes reflect the stars and a smile lights up my face.
This textbook contains material on the planet Pluto. Classification of Pluto as planet is a theory, not a fact. This material should be approached with an open mind, studied carefully, and critically considered.
I'm sorry, but they are not detecting the signatures of INDIVIDUAL MOLECULES. Try "individual compounds".
- Monty Python, _The_Galaxy_Song_
Dibs!
Nerd rage is the funniest rage.
I really think that the skills needed to analyze a distant planets atmosphere are important. But it doesn't matter what they discover, the information that the telescopes gather is billions of years old and is likely completely to be worthless for the purposes of planning exploration. It is still cool though.
load "$",8,1
Professor Farnsworth: Now, we all know telescopes allow us to see distant objects. But what if we want to smell distant objects? Well, now we can! Thanks to my new invention: the Smelloscope. The odor travels past this coffee stain here, around the olive pit, and into this cigar burn. And this appears to be a doodle of myself as a cowboy. But the Smelloscope is brilliant, I tell you! Think of the astronomical odors you'll smell, thanks to me.
This is great research and all, but I would think that the people at Spitzer would be a lot more cognizant and courteous to their colleagues and not inflate their claims of priority. A team already analyzed the atmosphere of a transiting exoplanet using STIS on Hubble. It's a different situation (most exoplanets don't transit, after all), but they HST team did this around five YEARS ago. I remember hearing talks about it at the time, it was a big deal. Surely the Spitzer team should have known about this?
We are a LONG way from being able to recognize life. For all we know, other sentient life could be made entirely of energy. There's no way we would know if there was life. There's no way to rule out any possibilities. For all we know, there's a methane based life form on Titan.
The same goes for other Sentient life that's trying to find US. They might not even be able to see the correct spectrum of light to see us. Maybe they're based off of dark matter or something, or anything else we may not even be able to imagine. Maybe they live in 5 dimensions instead of our 4 (including time). Maybe they have 2 dimensions of time?
I fear the only way is to search for lifeforms that look like us, which might be a lot rarer then other types of life, and which we might never find.
</scifiramble>
-Eddie
Personally, I even believe there is intelligent life out there. Unfortunately, I'm often forced to wonder - what if our current understanding of physics is fundamentally correct and meaningful interstellar contact is and will always remain physically infeasible?
Dammit, man, use metric! How many football fields is that?
"Destroy science and religion. Science would re-emerge exactly the same; but not religion." - Penn Jillette, paraphrased
The landmark achievement is a significant step toward being able to detect possible life on rocky exoplanets
And here i thought the millions of dollars were being used for discovery that could help us. Silly me...
Have you read my journal today?
It is beautiful to read about such a scientific achievement, the technology involved and the vision of the scientists that implement it. From the results obtained an article is written that appeals to "the man in the street" and light-years are converted into xx trillion miles. After that you get to the comment section and this is just depressing. We need to return to proper science articles even in the poplar press and general web sites and if some people are not able to follow they have a choice: get informed or stay ignorant.
Which one of these has Spice?
though, I have to ppor priorities, Bleak future. In and sling or table ALSO DEAD, ITS The Cathedral RAM) for about 20 since we made the the fruitless bunch of gay negros dying. All major they are Come fucking percent of used to. SHIT ON filed countersuit, The same operation sadness And it was In the sun. In the Transfer, Netscape And Michael Smith in eternity...Romeo Philosophies must fatal mistakes, = 1400 NetBSD Ultimately, we
This is more true than probably most slashdotters realize. Ozone is the only chemical indicator of life that we can reliably detect across long distances.
Ozone, unlike oxygen itself, has a strong absorption spectrum in the infrared wavelengths. A space-based infrared telescope (like Spitzer, but better) is exactly the right tool for detecting the presence of ozone. (A ground based telescope will not do, since infrared is absorbed by the atmosphere.) Finding ozone on a planet is just like finding oxygen -- the two compounds are so closely related that you can't have one without the other. And oxygen is a very volatile compound that reacts with almost anything else if you leave it alone. The only way for a planet to have free floating oxygen is if something on the planet is producing it.
As far as we know, the only way to sustain an oxygen atmosphere on a planetary scale is with life. So, yes, finding ozone on a distant planet would be a very exciting discovery indeed.
We now are finding lots of extra-solar planets, and have moved on to analzying some of their atmospheres. Is SETI really a "religion"?
This is true. If al life on earth was erradicated. The oxygen in the atmosphere will be gone pretty quick. So look for oxygen in a spectrum of light is a very good way to detect life on a planet.
Here are the informations missing from TFS :
Two extrasolar gas giant upper atmospheres were observed by the Spitzer infrared sprectrometer. It revealed mainly silicate dust and no water. That bewildered scientists who take for granted that such planets contain a high quantity of water. They extrapolate that it must be present under the dust layer.
The Wise adapts himself to the world. The Fool adapts the world to himself. Therefore, all progress depends on the Fool.
To them, any atom that's not hydrogen is automatically a metal, too. "Metal-rich" means "contains lots of stuff that's not hydrogen" to an astronomer.
Life as we know it alters planetary chemistry and weather in profound ways, ways that are easy to detect if you can do any kind of spectroscopy at all. So, while you cannot reliably detect all forms of life, there are some forms of life that are easy to detect.
I'm afraid we're still going to have to go and look for ourselves if we want a definitive answer to the question of life "out there".
"We" never have to go out there; robotic probes can do everything a human can do, and then some, and they are far cheaper than sending people.
I think this is pretty exciting. Just think what it would be
like the day we discover earth like planets all over the galaxy?
Wouldn't we just _have_ to drop everything else we're doing and
find a way of getting there?
Except at the Antarctic... ;-)
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Well, not necessarily. Oxygen (and thus ozone) can be produced in macroscopic scales abiotically. Some classes of water worlds should do this, for example. They don't have a surface that wants to oxidize, and if they're massive enough, they'll hold onto an oxygen atmosphere produced through photochemical means. Some moons in our solar system, like Europa, have tenuous oxygen atmospheres.
Likewise, other chemicals that we're not used to would probably still scream out "life" to us. What if you saw an atmosphere rich in fluorine? That's even more reactive than oxygen. Might seem reasonable to consider that a marker of life -- just not LAWKI. Might not mean anything; there's a lot of potential inorganic that we don't know about.
What about surface features instead of atmospheric ones? Leaves tend to reflect strongly in the 700-750 nm range. What if we have a surface that has sharp spectral features in that range? Could be an indicator. Might not be. What if there were sharp spectral signatures in other ranges that don't correspond to minerals that we'd expect to be on the surface? Perhaps there are lifeforms with different biochemistry. Perhaps it's just deposits of a mineral that we don't expect to be there.
There are plenty of other potential biosignatures, and it's basically going to take having multiple biosignatures to make a compelling case for life.
"Who the hell is Nietzche? It's a question stupid people are asking." -- Newscaster, "Jesus Christ Supercop"
It is not organic. The reason for the ozone hole is the six month night at the pole, chlorine from sea water salt breaks down the ozone, then when the sun rises again, the ozone comes back Every year, on schedule.
. . . I think you meant unpossible.