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