But some have odder shapes. Take Dimorphos — that is, before DART impacted it. It was an "oblate spheroid" — a sphere squished at its poles and stretched along its midriff, like a watermelon.

Having previously been a potato-shaped 'oblate spheroid' it’s now described by Naidu as "a ‘triaxial ellipsoid' – something more like an oblong watermelon." In the paper, co-authored by ...