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5 Great Cosmic Mysteries
posted: 30 June 2005
07:34 am
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Untitled DocumentThis series of five stories exploring the great unanswered questions of modern space science ran as part of our Science Tuesday presentations in early 2002.  | What is Dark Matter?
"Weve known that it exists for more than 25 years," says astronomer Virginia Trimble of the University of California Irvine. "But we dont know what the hell it is." |  | What is Dark Energy?
"Frankly, we just dont understand it," says Craig Hogan, an astronomer at the University of Washington at Seattle. "We know what its effects are," Hogan says, but as to the details of dark energy, "Were completely clueless about that. And everybodys clueless about it." |  | How Do Galaxies Form?
xA cosmic stork that's what astronomers need. Like curious children, they've been asking for decades, "Where do galaxies come from?" |  | Is There Life Beyond Earth?
"It seems to me the worst people to look for life are biologists," Nealson, also a senior scientist at the NASA/Caltech Jet Propulsion Laboratory, says. "Because theyre so darned sure of what life is that if it happened to be different, theyd miss it." |  | Are There Other Universes?
The irresistible, mind-boggling fantasy comes to just about everyone, sooner or later: What if everything we knew, our whole universe, was just a speck of dust on someone's shoulder? |
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