"Where is everybody?": This question, about the lack of aliens in the vast universe, is called Fermi's paradox - Copyright NASA/AFP/File HO "Where is everybody ...

Astronomers made headlines last week by suggesting potential signs of life on the distant exoplanet K2-18b—but is this truly our first glimpse of extraterrestrial beings, or simply wishful thinking?

For centuries, great thinkers have pondered why, given the hundreds of billions of planets in the galaxy, we have seen no compelling signs of intelligent life beyond Earth. Now, scientists are mulling ...