The Search for Alien ‘Footprints’: Scientist Rethinks Hunt for E.T. (SPACE.com)

SPACE.com - Any intelligent extraterrestrial life that exists probably won’t announce itself by blowing up the White House, or win over the hearts of children as a lovable alien with a glowing finger. Many scientists simply hope to find evidence of them by scanning the skies for a radio signal from a distant star’s alien civilization. But such efforts may also risk overlooking clues of past alien activity right here on Earth.

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