Mercury is the smallest planet in our solar system. Explore its size, extreme temperatures, core structure, and comparison ...

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

Since the 1990s, scientists have discovered approximately 6,100 planets outside our solar system, called exoplanets.

The Oort Cloud is often described as the outermost boundary of the solar system, but its true role remains uncertain. This vast, invisible region of icy objects may extend far beyond the orbits of ...

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

Six planets—including Venus, Jupiter, and Mercury—will line up in the sky. Here’s the best time to watch and where to find ...

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

The best “planet parade” of the year puts Venus, Jupiter, and more on display right after sunset—and you can see most of them ...

Astronomers have uncovered a distant planetary system that flips a long-standing rule of planet formation on its head. Around the small red dwarf star LHS 1903, scientists expected to find rocky ...

Surprised astronomers said Thursday they have discovered a star with planets in a bizarre order that defies scientific ...

Webb Telescope finds crystalline water ice around star HD 181327. This discovery could reveal how icy bodies contribute to ...