Astronomers have discovered four planets that are just a fraction of the mass of Earth orbiting Barnard’s Star, which is 6 ...

Four small, newly discovered worlds are less than six light-years away from Earth, and their discovery reinforces a ...

The two innermost planets, Venus and Mercury, will shine together low in the western sky at sunset on March 10. Here's how to ...

Astronomers have confirmed the existence of four planets orbiting a star less than 6 light-years away with help from some of ...

Inner planets are the four planets closest to the Sun: Mercury, Venus, Earth and Mars. They are collectively characterized by a solid surface and small size relative to the outer gas giants.

Early in our Solar System’s history, bits of icy debris were scattered and then gradually coaxed into a spiral alignment in ...

Last year, astronomers announced that a planet orbits Barnard’s star. Now, researchers have confirmed the existence of three more.

For the best chances, spectators should look at the sky as soon as the sun sets. That's when the planets will make a brief appearance. Tokyo started seeing the parade first, on Feb. 22 ...

A weak magnetic field likely attracted matter inward, contributing to the formation of the outer planetary bodies, from ...

After many previous claims and false alarms, astronomers can finally confirm the existence of at least four planets less ...