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Δευτέρα 3 Νοεμβρίου 2014

Weird wet worlds: Why Earth is lucky to have oceans




Many planets and moons harbour bizarre bodies of water 
– but that alone won't make them as life-friendly as Earth, 
say two planetary scientists...
WATER, water everywhere. As the keen eyes of our telescopes probe the cosmos, 
they see more of one molecule than anything else. 
Water in huge clouds around distant quasars, water shot from faraway stars, 
water in the atmospheres of giant planets.
That gives us hope we might soon find one thing we have long sought, but not seen: 
a beautiful blue water world quite like Earth. 
Given the sheer number of worlds we now know to be orbiting other stars, 
finding one like ours would seem to be just a matter of time.
Is it that simple? The more we learn about how Earth acquired and retained its water, the more it seems the situation was incredibly fortuitous. And as we ...
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