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 ...

IT has a surface temperature of minus 225 degrees Celsius and was once the ninth and most distant planet from the Sun. But how big is it? Here's all you need to know... Pluto is about one-sixth the ...

WHAT'S IN A NAME? Pluto is also the name of the Greek god of the underworld. It was suggested by many people as a name for Planet X, but the credit was given to an 11-year-old girl from England.

CAPE CANAVERAL, Fla. (AP) — The spotlight is bright enough to thaw even Pluto. Well, not quite, but the tiny, icy world is getting front-page, prime-time attention for its first visit by a spacecraft ...

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 ...