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

These are known as hypervelocity stars, with some moving faster than the escape velocity of the Milky Way of around 600 ...

New findings offer clues about the ancient origins of asteroids and their potential role in the formation of terrestrial ...

The four planet-strong "planet parade" currently visible to the naked eye in the night sky for a short time after sunset will ...

Two Grand Canyon-size features on the far side of the moon were likely formed in about 10 minutes after an unknown object slammed into the moon 3.8 billion years ago.

Many of the new planets have a "new terrain system" and that allows for truly towering mountains and even "oceans that can be several kilometers ... planet but it's the size of a real planet?" ...

YR4 has a 2% chance of hitting Earth in 2032. Astronomers are tracking it to refine estimates of its size and orbit to see ...

Astronomers have mapped the 3D structure of an alien planet's atmosphere for the first time, revealing a layered system of extreme winds.

New research suggests that dark energy isn't needed to explain the acceleration in the expansion of the universe — instead ...

Astronomers at the NASA Goddard Space Flight Center may have discovered a star hurtling through the Milky Way with a planet ...