has since been named "the man who killed Pluto." Worried that we might end up with too many planets in the Solar System without clearer parameters, the International Astronomical Union (IAU)—the ...

Here's what to know about the short life of what was, for a single human lifetime, the solar system's smallest planet. Pluto was discovered in 1930 by Clyde Tombaugh, an American astronomer at the ...

After passing Pluto, the craft will continue into the farthest reaches of the solar system. Scientists suspect there may be yet more moons around Pluto, some perhaps sharing or swapping orbits and ...

This phenomenon known as a "planet parade," will feature Mercury, Venus, Mars, Jupiter, Saturn, Uranus and Neptune all ...

Pluto, discovered in 1930, was once considered the ninth planet in our solar system. In 2006, the International Astronomical Union reclassified Pluto as a dwarf planet because it doesn't meet all ...

He searched for Planet X from 1905 until his death in 1916, without luck ... upon by spacecraft from Earth, Pluto remained the only one of the solar system’s major worlds that never received ...

NASA said it’s the largest known glacier in our solar system. Images of Pluto’s icy heart have appeared on screensavers and T-shirts and have been shared by news media worldwide. Even without ...

Pluto was discovered 95 years ago on Feb. 18, and even though it was demoted nearly two decades ago, it remains a fascinating part of our solar system. "Pluto is a complex and mysterious world ...