Today, the dwarf planet Pluto orbits the sun from the edge of our solar system and its surface temperature is an inhospitable negative 378 to negative 396 degrees Fahrenheit. But a new study suggests ...

Pluto is no longer classified as a planet, it’s a dwarf planet, however, it still has five moons. Now astronomers say they ...

CAPE CANAVERAL, FL -- Come Tuesday, Clyde Tombaugh will pass within 7,800 miles of the icy world he discovered 85 years ago. His ashes are flying on NASA's New Horizons spacecraft on humanity's first ...

Pluto is the most well-known dwarf planet. NASA / Johns Hopkins University Applied Physics Laboratory / Southwest Research Institute . Out beyond Neptune, past Pluto, through the chaos of the Kuiper ...

Our solar system now, once again, officially consists of only eight planets. Although largely debunked, speculation continued ...

Since Pluto's discovery in 1930, there have been nine planets in the solar system, but a year ago, scientists at the California Institute of Technology said there were ten. An object they called Xena ...