Found in the northern sky, GJ 3378b is a potentially rocky world with liquid water on its surface, receiving 90% of the ...

Most of the planets astronomers discuss are bound to a star, circling it in a steady orbit the way Earth circles the Sun. But ...

There are a couple of ways that scientists can date planets, so which planets formed first in our solar system?

Two continent-sized structures deep inside Earth may contain remnants of Theia, the ancient planet thought to have collided ...

Add Yahoo as a preferred source to see more of our stories on Google. Stargazers who have heard of an amazing planetary alignment coming later in January may be in for a letdown if they look up at the ...

Backyard astronomers won't want to miss this special phenomena that will occur next week.

Hundreds of Venus-like planets could soon help determine why some worlds become sweltering greenhouse hellscapes while others ...

It's nearly 170 million years old. It's more than 2.5 times the size of Earth. And it's the first exoplanet discovered and ...

A celestial phenomenon is forming in the Northern Hemisphere on Friday, as seven planets are expected to appear lined up in the night sky. Most are expected to be visible to the naked eye, though not ...

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. A planet parade — mistakenly called a planetary alignment by ...