Astronomers have long debated what kind of chemistry might serve as a bona fide alien biosignature
What Would Signal Life on Another Planet?, Science
Radio signal from nearby planet could mean alien life is present
Only lunar telescopes can answer the mysteries of the Universe
Stellar Storms May Light Up Signs of Life on Alien Planets
Panspermia theory dives under other worlds' ocean ice crust
Scientists develop new strategies to discover life beyond earth
What Would Signal Life on Another Planet?, Science
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Are we alone? Tiny spacecraft will head to Alpha Centauri to find
Second Earth-sized World Found in System's Habitable Zone