Brian Green

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With so many nice planets out there, why would aliens attack Earth?

They're baaaack: Movies about aliens are invading the theaters again — in forms ranging from the evil villains of "Pacific Rim" to the benign federation of "Star Trek Into Darkness."<p>The saga of extraterrestrials menacing Earth goes at least as far back as "War of the Worlds" — as in the 1898 H.G. …

Space Tourism's Black Carbon Problem

The industry and the F.A.A. say the climate effects of flying civilians into space will be negligible, but some scientists fret about the accumulation of black carbon in the stratosphere.<p><i>This story is part of a special PopularScience.com series on the future of energy.</i><p>Virgin Galactic proudly touts …

NASA telescope's planet-hunting days may be over | Reuters

CAPE CANAVERAL, Florida (Reuters) - NASA’s first telescope dispatched to hunt for Earth-like planets that may support life elsewhere in the universe has lost use of its positioning system, threatening its mission, officials said on Wednesday.<p>Tourists take pictures of a NASA sign at the Kennedy …

Human embryonic stem cells created from adult tissue for first time

Scientists have used the cloning technique that led to Dolly the sheep to turn human skin into embryonic stem cells – which can make any tissue in …