Breaking space news, the latest updates on ... Related: New Horizons Pluto probe notches 3 new discoveries in outer solar system ...

Clyde Tombaugh discovered Pluto in 1930 at Lowell Observatory in Flagstaff. Here's how Pluto won - and lost - its planetary ...

Breaking space news, the latest updates on rocket launches, skywatching events and more! He called this hypothetical world "Planet X." "In some ways, Pluto's more of a planet than some of the ...

In 2006, the International Astronomical Union (IAU) decided that a large celestial object is a planet only if its gravitational orbit around the sun makes it round and if it’s big enough to ...

This high-resolution image captured by NASA's New Horizons spacecraft combines blue, red and infrared images to show a bright expanse on Pluto ... outer heliosphere, said Andrew Poppe of the Space ...

Because of this, the IAU reclassified Pluto as a dwarf planet, a category that includes other small, round objects in the outer solar system. Despite the change, Pluto remains a beloved celestial ...