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 ...

On 2/18/1930, American astronomer Clyde Tombaugh discovered Pluto. We celebrate the plucky dwarf planet with a scale model replica of the solar system in Maine.

Beyond Pluto lies a collection of frozen worlds that challenge traditional ideas of what planets should be. This episode ...

We classified Pluto before really understanding it—just like we reduce people to job titles or put names on relationships ...

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

On Feb. 18, 1979, snow fell in the Sahara Desert in southern Algeria for the first known time. It fell a second time in 2016 and a third time in 2018.

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

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

Discover the Kuiper Belt: a frozen ring of dwarf planets and trillions of icy bodies, currently being explored by NASA's New Horizons mission.

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

On Feb. 18, 2001, auto racing star Dale Earnhardt Sr. died in a crash in the final lap of the Daytona 500; he was 49. In 1885 ...

Since the 1990s, astronomers have found a handful of other dwarf planets in the belt, such as Eris and Sedna, along with ...