A newly studied solar system breaks the usual planet pattern, raising fresh questions about how rocky and gas planets form.

The fourth planet in the system is a rocky world, while the second and third ones are gas planets.

By Will Dunham WASHINGTON, Feb 14 (Reuters) - Astronomers have observed a planetary system that challenges current planet ...

A planetary system 116 light-years from Earth has a peculiar pattern. It could flip the script on how planets form, scientists say.

Gas giants possibly developed slowly in the solar system. They developed cores layer by layer within a disk of ice and dust ...

At the farthest edges of the solar system, strange objects follow paths that defy easy explanation. This story investigates ...

A closer look at the planets around a star called LHS 1903 may just flip our understanding of how planetary systems form.

Add Yahoo as a preferred source to see more of our stories on Google. Digital art of distant planet - Dottedhippo/Getty Images On August 24, 2006, our solar system lost a planet. It wasn't by ...

Astronomers have found a distant world that challenges planetary formation theory, with a rocky planet where gas giants should be.

Updated measurements from NASA’s Juno spacecraft could help researchers better understand the planet's mysterious interior, ...

Far from the Sun’s heat, orbiting the outer planets of the solar system, are moons with oceans of liquid water beneath their frozen surfaces. Keith Cooper finds out how planetary scientists are ...

While its star projector leaves a lot to be desired, the Science Can Solar System Planetary Projector is a fantastic educational tool for kids, with its solar system model, complete with talking ...