The International Astronomical Union (IAU) defined a dwarf planet in 2006 as a celestial body that orbits the Sun, is round in shape, but has not cleared its orbital neighborhood of objects of ...

For the better part of a century, we believed there were nine planets in our solar system, with Pluto being the farthest from the sun. Since the discovery of more Pluto-sized dwarf planets, that ...

This article was originally published at The Conversation. The publication contributed the article to Space.com's Expert Voices: Op-Ed & Insights. Vahe Peroomian, Professor of Physics and Astronomy, ...

Vahe Peroomian has received funding in the past from the National Science Foundation and from the National Aeronautics and Space Administration. The word “planet” came from the ancient Greek words ...