14 missions to comets, 20 to asteroids, and around 50 planetary small moons imaged well enough to see their shapes. Under a hundred miles in diameter many have

14 missions to comets, 20 to asteroids, and around 50 planetary small moons imaged well enough to see their shapes. Under a hundred miles in diameter many have irregular shapes. I would guess this shape only occurs a few percent of the time. Wednesdays news conference speculated UT shape is primordial, while the others may have been carved through four billion years of planetary evolution.