To be a planet, NASA says an object must be big enough that its gravity has cleared away any other objects of a similar size near its orbit around the Sun. I can understand how something can clear ...

Explore 25 Major Events in Earth's 4.5 Billion Year History. Discover pivotal moments from its formation to the rise of life.

Scientists have discovered a bizarre planetary system where a rocky world orbits farther out than giant gas planets, defying ...

Our solar system appears beautifully organized, but its stability is actually the result of an incredibly delicate cosmic ...

Using nearly a decade of satellite observations, NASA's Black Marble project reveals a constantly shifting portrait of human ...

Neptune’s moons have long provided evidence of a cataclysm four billion years ago. A new study suggests one moon may have ...

James Webb Space Telescope reveals weather patterns from how planet WASP-94 A b filters the light of its parent star.

The space industry's plans to launch millions of satellites worry scientists as the rise in high-altitude air pollution ...

Our galaxy and its nearest large companion, Andromeda, may be headed for a collision on a cosmic scale. What happens then?

The biggest episodes of the past have altered the course of human events, according to researchers. An emerging one is ...