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

"I'm becoming much more optimistic that we may be able to find life beyond Earth, even in our own solar system." ...

"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 ...

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

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

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

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

Learn more about two of the earliest reports of a total solar eclipse and corona, which were recorded in China, and solve ...

It takes light a single day to travel 16 billion miles. The Voyager 1 probe will need a little longer, just 49 years.

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