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 ...
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 ...
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