The debate over Pluto’s planetary status has been ongoing since its reclassification as a “dwarf planet” in 2006 by the ...

Pluto suffers from a century-long winter ... including the half that was shrouded when New Horizons sailed past. They would ...

Pluto was quickly heralded as the ninth planet in the solar system when it was spotted Feb. 18, 1930 by Clyde Tombaugh, a young amateur astronomer at Lowell Observatory (search). It still holds ...

New data from the James Webb telescope reveals that Pluto's strange atmospheric haze controls its climate, surprising scientists.

Pluto is known to have five moons: Charon, Nix, Hydra, Kerberos and Styx. Charon, the innermost moon, was first spotted in 1978; at 648 miles (1,043 kilometers) in diameter, it's nearly half as ...

This isn’t a random search. For most of the 20th century, Pluto was assumed to mark the end of the planetary road – the last gas in the solar system. It was the only large body beyond Neptune.

The hazard search was sensitive enough to find moons 15 times fainter than Pluto's dimmest satellite, Styx, if any existed beyond the orbit of Charon, researchers said.

If I pick a frame with Charon almost above Pluto and then when it is almost below it, that would be half an orbit. Looking at the time stamps on each frame, this would give a time of about 3.2 ...

In just about a year, the New Horizons spacecraft will begin daily observations of the dwarf planet Pluto. A month later, on 14 July 2015, the piano-sized 478-kilogram probe will fly by Pluto at a ...

Pluto is on average 40 times further from the Sun than Earth is—too far away from Earth to be seen with the naked eye—with sunlight taking around 5.5 hours to reach it. It receives just 1/ ...

A NASA spacecraft speeding toward Pluto is casting a wary eye on the dwarf planet system, looking for anything that could trip it up in the home stretch of its historic mission. NASA's New Horizons ...