“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?

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 ...

Pluto was discovered at Lowell Observatory in Flagstaff, Arizona in 1930 and was considered our ninth planet until 2006. The International Astronomical Union reclassified Pluto as a dwarf planet ...

The controversy endures over Pluto's true status ... Kansas where he spent his days working the earth. At just 23 years old, Tombaugh sent his drawings, unsolicited, to several institutions ...

"Pluto isn't massive enough to capture Charon through a normal mechanism," says Denton of the old models. But Denton and her team's code more accurately models the strength of the materials in the ...

An 11-year-old English schoolgirl, Venetia Burney, suggested the name Pluto, the god of the underworld. Tombaugh’s newfound fame earned him a scholarship to the University of Kansas, where he ...