Scientists are unsure what causes the planet to be so dark, but they believe it could be 'a chemical we haven't even thought of yet.'
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Despite all the nuclear fusion that has occurred in stars since the big bang, hydrogen is still by far the most abundant element in the universe, and makes up four-fifths of all ordinary matter. For a while it was touted as the fuel of the future, bu...
This Web-only article is a special rich-media presentation of the feature, " 12 Events That Will Change Everything ," which appears in the June 2010 issue of Scientific American . The presentation was created by Zemi Media . Find all our other...
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And for plenty of good reasons, since: