Neptune's winds travel at more than 1,500 mph, and are the fastest planetary winds in the solar system. Comets are cold, dirty aggregations of rock and ice that release gas or dust. The solid core of ...

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

A newly studied solar system breaks the usual planet pattern, raising fresh questions about how rocky and gas planets form.

Planets orbiting close to the most abundant and longest-lasting stars in our Milky Way may be less hospitable to life than previously thought. This conclusion comes from a new study using NASA's ...

A young star called V1298 Tau is giving astronomers a front-row seat to the birth of the galaxy’s most common planets. Four massive but extremely low-density worlds orbiting the star appear to be ...