Pluto

A friendly debate about Pluto's planethood yesterday (April 29) ended in an informal vote that came down in favor of reinstating the dwarf planet's status.

Ever since Pluto was demoted to dwarf planet in 2006, the debate over its planethood has raged on. Tonight, April 26, you can watch that debate online.

Researchers have noted a distinct dearth of small craters on Pluto and its largest moon, Charon.

A spacecraft orbiting the dwarf planet could use Pluto's moon Charon to make important orbital changes.

Scientists have spent 12 years arguing over how to classify Pluto, and a recently published paper offers a new — but surprisingly old — reason for restoring the object's planetary status.

"Ask a Spaceman" is live for the first time on Facebook — and astrophysicist Paul Sutter jumps right into it with a trip to Pluto.

Forty years ago, Pluto's largest moon Charon was discovered.

Scientists have put together new maps of Pluto and its moon Charon, showing the peaks and valleys of their surfaces in incredible detail.

Pluto has an extensive dune system, but the grains that make up the wind-blown mounds are certainly not sand, a new study reports.

Pluto may have long ago coalesced from 1 billion or so comets, a new analysis of data from NASA's New Horizons mission and the European comet-orbiting Rosetta probe suggests.