BBC Sky at Night Magazine on MSN
Aliens could detect our airports. Scientists say radar signals could reveal our presence across the galaxy
Planet Earth could be giving out its own signals, which could in turn be detected by distant astronomers on an alien planet ...
All the Latest Game Footage and Images from Alien on the Radar Multiplayer game of hiding and seeking. Become an alien and use stealth to deceive others, or a marine and survive long enough to escape.
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