On Feb. 18, 1930, Clyde Tombaugh discovered Pluto, at that time classified as the ninth planet.

Filmmaker Adam Nemoy helps celebrate the 90th anniversary of Pluto's discovery this month at the 6th annual 'I Heart Pluto' ...

In August 2006, the International Astronomical Union made the controversial, but correct, decision to demote Pluto from its ...

Scientific American is part of Springer Nature, which owns or has commercial relations with thousands of scientific publications (many of them can be found at www ...

On the surface of the dwarf planet Pluto, there's a 1,600-kilometer-wide area covered by a thick layer of nitrogen ice that ...

It was October 2001, and a leaky Lindley Hall roof and Lawrence light pollution had rendered the 1929 telescope — which had been refurbished by Pluto discoverer Clyde Tombaugh — nearly useless.

Pluto was discovered in 1930 by Clyde Tombaugh while he worked at Lowell Observatory in Flagship, Arizona. Sputnik Planitia is a white basin measuring 750 by 1,250 miles near Pluto's equator that ...

For decades, Pluto was celebrated as the ninth planet of our solar system. However, in 2006, the International Astronomical ...

See the full interview on NBC News. " data-portal-copyright=""> Astronomers were comfortable with those classifications even ...