Six planets—including Venus, Jupiter, and Mercury—will line up in the sky. Here’s the best time to watch and where to find ...

Planetary systems in the Milky Way galaxy tend to follow a particular pattern: rocky planets toward the center, closest to ...

Scientists discussed the threat of asteroids at a recent conference in Phoenix. Here's what they said.

"We don’t know where they are,” said NASA’s planetary defense officer Kelly Fast at the AAAS conference in Arizona this week.

Nearly 10 years after retiring from mixed martial arts, Ronda Rousey revealed she will return to the sport to take on Gina Carano in a fight streaming live on Netflix May 16.

A new study focused on cryptic species—animals that look the same but are genetically different—found that they’re more widespread among vertebrates than we previously thought.