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originally posted by: InachMarbank
originally posted by: muSSang
a reply to: InachMarbank
How can you detect oxygen (or other atmospheric elements) trillions of miles away?
The can do this almost the same way they detect how a planet is there, when the planet passes the sun the light spectrum changes depending on the planets atmosphere. Its amazing how far we have come in 20 years.
Now, different elements absorb light, rather than allowing it to pass through, but they only absorb certain parts of the light spectrum. This generates a “light signature”.
And its remarkably simple.
If we were to look at a light spectrum coming from Earth, for example, the “barcode” would be missing the frequencies that correlate to nitrogen, oxygen and argon would be missing, as those compose Earth’s atmosphere (78%, 21% and 1%, respectively).
This link helps with blue red shift and explains how they can tell the chemical composition
Thanks for that explanation.
Do you know the magnification power of the TRAPPIST telescopes?
originally posted by: Tempter
Zero evidence of life outside Earth. None.
That is all.
originally posted by: wildespace
I wonder if the VLT (Very Large Telescope) could be used to find and study exoplanets. After all, its mirrors are 8 meter in diameter each, about 4 times as large as the Hubble's. And trust me, when it comes to astronomy, the mirror size (and, thus, the resolving power) is more important than the magnification power.
originally posted by: kiliker30
a reply to: muSSang
THIS, my friends, IS progress.
Reminds me of men in black when Kay is talking to jay on the bench.
Kay: "A person is smart. People are dumb, panicky dangerous animals and you know it. Fifteen hundred years ago everybody knew the Earth was the center of the universe. Five hundred years ago, everybody knew the Earth was flat, and fifteen minutes ago, you knew that humans were alone on this planet. Imagine what you'll know tomorrow."
People said we would never find planets that we were it.
We showed them huh.
originally posted by: BenSisko
I'm not an expert at this by any means, so a question is floating around in my mind for quite some time now. Isn't it possible with one of those telescopes to look for light sources on other planets, especially the earth-like ones? I remember the "universe" picture taken by the Hubble telescope, which shows a tiny speck of the observable universe with hundreds of Galaxys being visible, but no detailed pictures of planets' surfaces in our relative neighborhood.
I guess it's just a question to make the picture sharper, maybe some configurations to one of the telescopes would make it possible.
As bright as the light of big cities might seem, currently Earth's night side is roughly 600,000 times dimmer than its day side. Existing telescopes could only see the night side of a world like Earth out to a distance of a little more than 1,000 astronomical units — that is, the edge of the solar system. "The closest star is 100 times farther than that," Loeb said. To see nighttime city lights as bright as Earth's on a world in the habitable zone of the closest star, you would need a telescope with optics at least 100 times wider in diameter than the Hubble Space Telescope's, he added.