Computer simulations have reconstructed 122 possible scenarios for the evolution of the solar system, 3 to 4 billion years ...

Astronomers have detected the first repeating daily weather cycle on a planet outside our solar system, a gas giant roughly ...

Four-and-a-half billion years ago, a massive world—possibly as big as the moon or even Mars—orbited our sun before crashing ...

Scientists may have found one of the main sources of rocky material for the solar system, forming diverse populations of baby ...

Our solar system has two ice giants, Uranus and Neptune, but there may have been a third. According to a new study published ...

New research suggests the moons of Jupiter and Uranus may hint that our planetary neighborhood once had a third ice giant.

Add Yahoo as a preferred source to see more of our stories on Google. An artist's conception of a gas giant world (the large planet on the right) in another solar system. The distant world WASP-121b ...

Though long theorized to exist, the first exoplanet was detected in 1991. Since then, their known diversity has increased exponentially.

NASA’s James Webb Space Telescope has uncovered a rare alien world that sits in a cosmic “sweet spot” between scorching hot Jupiters and frozen gas giants like Saturn.

In the remote outer reaches of planetary systems, far beyond the orbit of known planets, enormous and mysterious worlds silently loop around their stars. Some drift as far as 10,000 times the distance ...

A recent astronomical discovery has shaken long-held beliefs about how planets form. For decades, scientists thought that stars much smaller than our Sun couldn't form giant planets. That theory just ...