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

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

Sci-fi planets like Dune's Arrakis and Star Wars' Tatooine might look cool, but according to NASA they're more fiction than ...

An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit ...

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

Certain extreme planets are called ultra-short period objects if they're very close to their stars and orbit them in mere hours, like K2-22b.

The building blocks of life could have been delivered to Ceres by one or more space rocks from the outer asteroid belt.

Sean Murray says new engine advances in Light No Fire's development creates "…this urge to share it with the [No Man's Sky] ...

Thirty years after the discovery of the first exoplanet, we detected more than 7000 of them in our Galaxy. But there are ...

Young supernovas could have spread water out into the cosmos, causing planet formations earlier than originally thought.

The extreme supersonic winds of WASP-127b are more than 60 times faster than the fastest winds ever observed on Earth ...