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The Fermi Paradox: If Aliens Exist, Why Has Nobody Found Us Yet?

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The universe is 13.8 billion years old. It contains an estimated two trillion galaxies, each with hundreds of billions of stars, many with planets orbiting in habitable zones. The mathematical probability of intelligent life existing elsewhere is extraordinarily high. So where is everybody? The Fermi Paradox is the most unsettling question in science — and the proposed answers range from reassuring to deeply disturbing.

The Wow! Signal: The 72-Second Transmission That Still Has No Explanation

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On August 15 1977 a radio telescope in Ohio picked up a 72-second burst of radio waves so powerful and so perfectly structured that the astronomer who spotted it circled the printout and wrote a single word in the margin — Wow! It has never been detected again. Nearly 50 years later science still has no confirmed explanation for what it was.

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