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

A blue atmosphere, smooth areas, and youthful mountain ranges - this dwarf planet is full of surprises. When NASA's New Horizons probe flew past Pluto in July 2015, the images it returned astonished ...

Tthe dwarf planet Pluto (R) and Charon are shown July 11, 2015. (Photo by NASA/JHUAPL/SWRI via Getty ... [+] Images) Researchers studying Pluto and Charon have long drawn a parallel to how Earth ...

A New Horizons image of Pluto and its moon Charon revealed more surprises about the dwarf planet and its orbiting moon. Click on the hand to see why Pluto and its moon have shaken things up.

Beautiful photos of the six planets aligned in the night sky have emerged online. Mars, Jupiter, Uranus, Neptune, Venus and Saturn are all currently lined up in a row and will be visible in the night ...

But should they? Is Pluto even a planet? According to Dr. Grundy, Pluto is a planet. "I use the word 'planet' to refer to it, and most of the planetary science community does too," Grundy said.

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

Planitia structure on its surface. Ever since NASA's New Horizons sent back the first-ever photos of Pluto in 2015, the dwarf planet's mysterious heart-shaped region has puzzled scientists.

Whereas a moon usually orbits a planet, both Pluto and Charon orbit ... that the Hubble Space Telescope produced the first image of both Pluto and Charon with clear space between them.