It’s not just Pluto, New Horizons also snapped some stunning images of Pluto’s satellite, Charon. Charon is Pluto’s moon. About half of Pluto’s size, Charon is the largest known satellite ...

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 ...

“New Horizons shattered a major paradigm of planetary science,” says Alan Stern, the mission’s principal investigator. “Pluto turns out to have as much complexity as Mars or Earth, so much so that I ...

(Correction: An earlier version of this story misstated how far Pluto is from the sun. The correct number is 3.7 billion miles.) What was discovered in Flagstaff, Arizona, and killed off in Prague?

Famously, Pluto no longer met the criteria and was ... the moon was demoted to a satellite, and the sun got promoted. This ...

One of the most memorable images taken by New Horizons is that of Pluto’s "heart" feature. The heart-shaped glacier, nicknamed Sputnik for Earth’s first human-made satellite, is nearly 600 ...