Topic: Lisa Kaltenegger
For a planet to support life, it faces long odds: It has to be the right size, right composition, and right distance from its star. On Monday astronomers announced a trove of new planet 'candidates.'
09/12/2011 09:27 pm
Floating mountains? Glowing plants? They're in 'Avatar,' and they're not beyond the realm of scientific possibility.
12/28/2009 06:23 pm