Later in December, the 3I/ATLAS interstellar comet will get as close to Earth as it ever will. Here's what to know.

Earth may have a moon today because a nearby neighbor once crashed into us, a new analysis of Apollo samples and terrestrial ...

Of the seven Earth-sized worlds orbiting the red dwarf star TRAPPIST-1, one planet in particular has attracted the attention ...

NASA has released new images of the interstellar comet 3I/ATLAS, captured by various ground and space telescopes. Officials also dismissed conspiracy theories that the comet could be extraterrestrial ...

A comet named 3I/ATLAS, originating from outside our solar system, is passing through Earth's cosmic neighborhood. NASA has released new images of the comet, which is only the third interstellar ...

An interstellar trespasser known as 3I/ATLAS is almost certainly a comet. So, why do so many people think it's extraterrestrial technology?

"During the early solar system's game of cosmic billiards, Earth was struck by a neighbor,” said Dauphas. “It was a lucky shot. Without the moon's steadying influence on our planet's tilt, the climate ...

Nearly 4.5 million years ago, two large, hot stars brushed tantalizingly close to Earth's sun. They left behind a trace in ...

Roughly four and a half billion years ago the planet Theia slammed into Earth, destroying Theia, melting large fractions of Earth’s mantle and ejecting a huge debris disk that later formed the moon.

Our Solar System has eight planets, a few dwarf planets and more than 200 moons. But wait. Are you seeing double? Or did ...