The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

Our Solar System is simple—one star, planets orbiting around it. But what happens in a system with multiple stars? Scientists ...

Stargazers will be treated to a rare seven-planet alignment in February. This is what scientists hope to learn.

Star Wars is a vast and wonderful universe that continues to ... Without further ado, and in no particular order, here are some of the coolest planets that have come out of the Star Wars franchise.

Worlds with liquid water could have formed just 200 million years after the big bang from the remains of the earliest ...