A new telescopic survey of Hygiea—the fourth largest object in the main asteroid belt—suggests it’s a dwarf planet, due to its surprisingly spherical shape. Discovered in 1849 by Italian astronomer ...

Everybody remembers where they were when the beloved celestial wanderer, Pluto, was downgraded from a planet to a dwarf planet—we’re sure Neil deGrasse Tyson does, anyway. Now we have somewhat of a ...

This is a fantastic question Lionel, and a really good observation! When we look out at the Solar System, we see objects of all sizes — from tiny grains of dust to giant planets and the Sun. A common ...

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