The Fermi Paradox

The universe is huge and very old. There are billions of stars and planets. So where is everybody? That question is called the Fermi Paradox. It was asked by the famous scientist Enrico Fermi in 1950. If alien life is possible, it seems strange that we have found no sign of it.

The Big Question

Our galaxy has about 200 billion stars. Many of those stars have planets. The galaxy is over 13 billion years old. If even a tiny fraction of planets develop intelligent life, there should be many alien civilizations out there. Some should have had millions of years to develop technology and travel through space. Yet we have found no evidence of any of them.

Possible Answers

Scientists have come up with many possible answers to the Fermi Paradox. Maybe intelligent life is much rarer than we think. Maybe civilizations destroy themselves before they can travel the stars. Maybe aliens are out there but are too far away to detect. Or maybe they are avoiding us on purpose. Nobody knows the real answer yet.

Fun Facts

• Enrico Fermi asked his famous question during a lunch conversation with other scientists in 1950.
• There are over 100 proposed solutions to the Fermi Paradox.
• Some scientists think the answer might be that we are one of the first intelligent civilizations in the galaxy.

Did You Know?

One idea called the Zoo Hypothesis suggests that advanced aliens know about us but are watching from a distance, like we watch animals in a wildlife reserve.