Pluto, a celestial snowball with a surface of methane ice some 3.6 billion miles from the sun, might be making its way back into the solar system fraternity. First discovered and classified as planet ...

Eight years after being reduced to a "dwarf planet" by the International Astronomical Union in 2006, our far distant cousin is finally getting some real push to be upgraded back to the ninth "planet" ...

Earth has a newly-discovered neighbor in the solar system. But the heavenly body – possibly a dwarf planet à la Pluto – isn't a frequent visitor. Located beyond Neptune, its extreme orbit ...

The science community may be ecstatic over the discovery of a ninth planet, but the former planet "Pluto" had a totally different reaction. Hours after scientists announced there's solid evidence of ...

Michael Rowan-Robinson has never shied away from change. In 2006, Rowan-Robinson, professor of astrophysics at Imperial College London, was part of the debate over whether or not Pluto should still be ...

This article was originally published at The Conversation. The publication contributed the article to Space.com's Expert Voices: Op-Ed & Insights. Samantha Lawler, Assistant professor, Astronomy, ...

As elementary schoolers, we learned the order of the planets. Maybe your teacher even had a snappy mnemonic like “My Very Educated Mother Just Served Us Nine Pizzas” or “My Very Educated Mother Just ...

On this day, August 24, 2006, the International Astronomical Union (IAU) made a decision that was going to change the Solar System forever. Members of the IAU voted on a long-drawn proposal that ...

On this day, August 24, 2006, the International Astronomical Union (IAU) made a decision that was going to change the Solar System forever. Members of the IAU voted on a long-drawn proposal that ...