February 18 marks the discovery of Pluto by astronomer Clyde W. Tombaugh. The discovery reshaped the understanding of the solar system, as Pluto was long considered ...

Scientists have identified a rocky outer planet in a system where a gas giant was expected. The discovery challenges ...

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 ...

Planetary systems in the Milky Way galaxy tend to follow a particular pattern: rocky planets toward the center, closest to ...

People can't quite believe the Donald Trump photo Nicki Minaj just posted ...

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

Scientists suggest that huge reserves of hydrogen inside the Earth may have been key in the formation of water.

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

Pluto's discovery by Clyde Tombaugh, key political changes in Scandinavia and America, plus cultural and scientific milestones.

Scientists may be one step closer in their hunt for signs of past life on Mars after the Curiosity rover's latest find.

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, ...

From 1905 until his death in 1916, Percival Lowell searched for a ninth planet, which he called Planet X. Lowell had predicted the planet based on irregularities in the orbit of Uranus. In 1929, ...