First discovered and classified as planet in 1930, Pluto was relegated to "dwarf-planet" status by the International Astronomical Union in 2006. They booted it out because there appeared to be a bunch of other big rocks just like Pluto out beyond the
NASA's New Horizons spacecraft is the first probe sent to Pluto, and it's scheduled to arrive in July 2015. This is an artist's concept of the spacecraft flying past Pluto. Poor Pluto. Is it or isn't it a planet? Ever since astronomer
Pluto can thank its lucky stars it's got a strong fan base on Earth. Reduced to the rank of "dwarf planet" by the International Astronomical Union in 2006, it's been waiting in the wings 7.5 billion kilometres away from Earth, bursting for its chance
Experts and audience contest its 'dwarf planet' status | In 2006, the International Astronomical Union demoted Pluto from its rank as a planet. But after an hourlong debate between planetary science experts on what constitutes
When astronomers stripped Pluto of its status as a planet in 2006, children and grown-ups raised a ruckus. Some kids even sent hate mail to the Hayden Planetarium complaining about Pluto's "demotion" to dwarf planet status