You might have a pretty clear mental picture of what a planet is, but the official definition is surprisingly contentious. The shock "demotion" of Pluto from planet to dwarf planet in 2006 shows just ...

Alfredo has a PhD in Astrophysics and a Master's in Quantum Fields and Fundamental Forces from Imperial College London. Alfredo has a PhD in Astrophysics and a Master's in Quantum Fields and ...

Pluto may be demoted again, as researchers work to properly define dwarf planets. PLUTO’S STATUS MAY TAKE a further hit, say Australian astronomers, if around 50 neighbouring space objects join the ...

A FARAWAY rock nicknamed DeeDee could be big enough to be a dwarf planet. Astronomers define dwarf planets as worlds that are massive enough for their gravity to make them spherical, but not big ...