The Fermi Paradox: Where Are All the Aliens?

Are we alone in the Universe? Perhaps not.

3D illustration of radio telescopes searching for astronomical objects at night. Source: solarseven, via Shutterstock.com.

As astronomers discover more about our Universe, the more we realize that Earth and all the people who live on it are just an infinitesimally small piece of a grander cosmic expanse. By our best estimates, our Universe is about 92 billion light-years across; that’s about 540 thousand billion billion miles across; and…