Quote:
Originally Posted by koop
That sounds really cool, but the thing I always wonder when I see stories like this is how the hell they can identify water vapor in space from 12 billion light years away...... Personally that's more interesting to me than the discovery to be honest. I can't imagine they would exactly get a clear picture of this in a telescope from 12 billion light years away, so how do they know it's water vapor? What even makes someone think it might be water vapor?
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Check out this website, better than any explanation I could muddle up.
http://missionscience.nasa.gov/ems/01_intro.html