NASA chief Jared Isaacman has doubled down on his stance that Pluto is without a doubt a planet. For two decades, controversy ...

Images of Pluto captured by NASA's New Horizons mission while on a flyby of the dwarf planet in July 2015 are still yielding new previously unheard-of details and insights about Pluto and its moons.

The head of NASA says maybe Pluto is a planet after all. He is wrong because Pluto is part of the rest of the solar system ...

NASA’sNew Horizons spacecraft has delivered extraordinary video footage showing towering ice mountains on Pluto’s moon Nix. These ice peaks, some rising as high as 11,000 feet, are made of pure water ...

NASA reignites Pluto planet debate, stoking U.S. pride and global pushback U.S. push to restore Plutos status collides with ...

If planets are, as many of your own geophysicists argue, bodies shaped by their own gravity and expressing internal processes ...