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

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

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

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 ...

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 ...

"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 ...

Space has a knack for bending our sense of scale. The Moon feels close enough to touch—after all, we see its craters with ...

Before the ribbon-cutting for the solar system walk on the Columbia Greenway Rail Trail on Nov. 29, created by WHS Astronomy ...

Mercury is the innermost and smallest of the eight major planets in our Solar System, orbiting closest to the Sun. Though ...

About 4.5 million years ago, a great cosmic dog kicked past our Solar System – and its effects may still be seen today.