IT has a surface temperature of minus 225 degrees Celsius and was once the ninth and most distant planet from the Sun. Pluto is about one-sixth the width of Earth, at just 1,420 miles in diameter. It ...

In 2006, Pluto was demoted from planet to “dwarf planet”-a reclassification that satisfied astronomers who felt its mass was too small to be a true planet. However, many people who grew up including ...

Pluto is so far away from Earth that everything we know about it can be written down on a couple of 3 x 5 inch index cards. But Pluto will come into clearer focus in a few years' time, though, as NASA ...

Pluto was once considered one of the solar system’s planets but was later downgraded to the status of ‘dwarf’ planet after several more similarly sized objects were discovered throughout our solar ...

CAPE CANAVERAL, Fla. -- Little Pluto is a little bigger than anyone imagined. On the eve of NASA's historic flyby of Pluto, scientists announced the New Horizons spacecraft has nailed the size of the ...

Pluto used to be a distant, mysterious point of light. But this week, NASA’s New Horizons spacecraft is quickly turning it into a fascinating new world. Scientists have only seen a handful of the ...

NASA ’s New Horizon’s probe reached Pluto today. In honor of its arrival, here are nine facts about the former ninth planet. In 2006, the New Horizons probe was launched (Pluto was still considered a ...

In this handout provided by NASA, Pluto nearly fills the frame in this image from the Long Range Reconnaissance Imager aboard NASA's New Horizons spacecraft, July 13, 2015. Getty Pluto, the icy object ...

This image, taken by NASA's Hubble Space Telescope, shows five moons orbiting the distant, icy dwarf planet Pluto. The green circle marks the newly discovered moon, designated P5, as photographed by ...

PLUTO was once considered the ninth and most distant planet from the sun but is now the largest known dwarf planet in the solar system. But how big is Pluto and how far is it from Earth? Please ...