Video: 10 Reasons We Still Haven’t Found Aliens

The Fermi paradox, first introduced by physicist Enrico Fermi, asks the question, “Where is everybody?” Or, more specifically, “Where are all the aliens?”

When we factor in the size of the universe, the number of Earth-like planets, and a range of other variables, there should be tens of thousands or more extraterrestrial civilizations in the galaxy. And with the galaxy being around 10 billion years old, scientists say that intelligent worlds would have had plenty of time to contact one another. So if aliens should statistically exist, why haven’t we encountered any yet? Here are some possible reasons.