Add Yahoo as a preferred source to see more of our stories on Google. What would happen if aliens contacted us? It’s a longstanding question that now has at least a partial answer, after a ...

In 2022, NASA knocked an asteroid off course in a test of humanity's ability to defend Earth.

With over 5,000 exoplanets — planets beyond our solar system — discovered to date, there's a growing interest in locating which of these planets might be habitable. It's no easy matter to find a ...