The end of the Cretaceous period saw disastrous geological and astronomical events, but researchers say that one in particular is to blame for the mass extinction.

The spunky Lucy mission will make a second gravity assist of our world tonight as it heads off on its hunt for the solar system's origins.

They look like asteroids, but act like comets.

A chunk of rock collected from the asteroid Ryugu contains bacteria—but, unfortunately, it's not evidence of alien life.