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

A new study analyzes three asteroid and two meteorite samples to see if space rocks smacking into Earth could’ve helped ...

The UK insurance market could propel the British space industry to the fore. Will we fire up those boosters, or let others ...

One of the longest stellar dimming events ever observed was likely caused by the gigantic saucer-like rings of either an unseen brown dwarf or "super-Jupiter" blocking its host star's light, ...

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 ...

By Will Dunham WASHINGTON, Feb 14 (Reuters) - Astronomers have observed a planetary system that challenges current planet formation theories, with a rocky planet that formed beyond the orbits of its ...

Their observations of a faint, cool M-dwarf star called LHS 1903 revealed a system with a rocky world at its outer edge. LHS ...

Scientists discover a 21-million-year-old dwarf sea cow that grazed in the Arabian Gulf, revealing how it transformed marine ...

The comet is now racing away from the sun following a close flyby on Jan. 20.

A recent study showed that Mars was warm and wet billions of years ago. The finding contrasts with another theory that this era was mainly cold and icy. The result has implications for the idea that ...

A newly identified planet candidate, HD 137010 b, looks strikingly Earth-like in size and orbit — but it may be colder than Mars due to its dimmer star. If it has a thick enough atmosphere, though, ...

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