This pair of objects were the subject of a controversy that threatened to undermine our basic understanding of cosmic ...

A newly released study of unusual asteroid orbits strengthens the case for the hypothesized distant, massive Planet Nine.

If the JWST can see galaxies billions of light-years away, why can’t it find the proposed Planet X in our solar system?

PRIMA — the Probe far-infrared Mission for Astrophysics — is in the proposal stage, with hopes to be launched by the end of ...

The Moon moves down an early-morning line of planets while Eta Aquariid meteors streak through the sky this week.

The long-delayed Starliner mission, if successful, will give NASA and future space tourists more options for getting to low ...

The evening sky loses its last planet early in May, shifting the attention of planetary observers to the morning.

The spiders on Mars form during the planet's springtime when temperatures rise and rays of sunlight touch the ice layers of ...

The volume density of asteroids in the main belt about 10 times higher than that of Jupiter’s Trojan asteroids.

Discovering new black holes is no easy feat — where do you even begin to look? New data and techniques help us get closer ...

Simulations show that a slow, shallow impact formed the western half of Pluto's heart - and also shed light on the dwarf ...

Barry Wilmore and Sunita Williams will be aboard the Starliner, scheduled to launch at 10:34 pm EDT on Monday, May 6.