Space.com on MSN
Making contact with ET? Aliens may already know we're here
Earth is dotted with humongous, human-made structures that, to an alien eye, may be tell-tale signs of intelligent goings-on.
Starlust on MSN
Humans can reach Alpha Centauri within lifetime by boarding a light-powered spacecraft
New laser-assisted technique may one day replace fuel-driven rocket propulsion ...
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