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Evidence of fire-raining comet discovered on Earth

Roughly 28 million years ago, a comet rained down a "shockwave of fire" over Egypt when it entered Earth's atmosphere and exploded, according to findings that offer the first concrete proof of such a phenomenon.

By October 8, 2013


Solar power to set sail in space

NASA will launch its first solar sail as early as July 29, potentially changing the way space is explored.

By June 27, 2008