The Galaxy Should Be Full of Aliens. So WHERE Is Everybody?

Our galaxy is old enough and big enough that it should already be crawling with alien civilizations. Instead, it's silent.

The Milky Way holds hundreds of billions of stars, many with planets, and it's over thirteen billion years old. There has been more than enough time.

In 1950, the physicist Enrico Fermi did a quick calculation over lunch. Even spreading between stars slowly, at speeds we can already imagine, a civilization could settle the entire galaxy in a few million years. Against the galaxy's age, that's the blink of an eye. So if intelligent life is even slightly common, some civilization should have crossed the Milky Way long ago, and we'd see their probes, signals, or ruins everywhere we look.

But we see nothing. No signals, no machines, no trace. Fermi captured it in one haunting question: where is everybody? Decades later, we still have no answer, and that silence might be one of the most important facts in science.

Follow The Cosmic Vault — the universe is stranger than you think.