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

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

Comet 3I/ATLAS was full-on erupting into space in December 2025, after its close flyby of the sun, causing it to ...

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

For millions of years, a frozen wanderer drifted between the stars before slipping into our solar system as 3I/ATLAS—only the ...

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

The fate of a comet that was predicted to pass close to Earth remains a mystery five years after its dramatic breakup in the ...

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