Why haven‘t we found aliens? | 为什么外星人还没被发现？

Why haven’t we found aliens? | 为什么外星人还没被发现？

Chances are, we’re not alone in the universe. But if that’s true — why can’t we seem to find our neighbors? This question is known as the Fermi paradox, and it continues to go unsolved. However, some theories could offer potential solutions. Physicist Brian Cox explains the paradox and walks us through our best guesses as to the reason for our quasi-isolation.