Space

Light is faster than anything else in the known universe, though its speed can change depending on what it's passing through.

During the Tunguska event, over 8 million trees covering an area of 830 square miles were flattened when an asteroid entered Earth's atmosphere.

A new study questions if our planet could capture rocky and icy visitors from outside the solar system — and how scientists could spot them.

A newly discovered supernova can be watched as it develops in real-time online and for free. The livestream will begin at 6:30 p.m. EDT (2230 GMT) on Friday, May 26.

Japan's private Hakuto-R spacecraft broke into at least four large pieces of debris, according to new images from NASA's Lunar Reconnaissance Orbiter.

A potential intermediate-mass black hole may be lurking in Messier 4, the nearest globular star cluster to Earth, new Hubble data reveals.

A polar cyclone is swirling on Uranus, further showing that the planet's atmosphere is a hive of hidden activity.

LIGO has been upgraded to observe gigantic black hole mergers 5 billion light-years away.

Space, outer space, and deep space — which is further out, and which is the real final frontier?

The exploding meteor, known as a bolide, also created a sonic boom that shook a nearby town.