[marron]

Maybe they are relatively new?

[Red Badger]

Gravity.....................

[gr8eman]

Why am I suddenly craving donuts?

[Doctor DNA]

Too much man made solar warming melted them?

[Paal Gulli]

Astrofizzicists theorize that a planet has to be of a certain minimum size (diameter) before it's own internal gravitational forces will be strong enough to pull it into a spherical shape. Planets smaller than that minimum size tend to remain "potato-shaped," so they have termed this factor the potato radius.

The 'rule of thumb' for potato radius is 200km, and the three moons in consideration, Pan, Atlas and Prometheus, all are well less than 100km in diameter. Plus they orbit much closer to a massively larger planet, so their own internal gravity has to contend with Saturn's overwhelming tidal forces.

Earth's moon suffered a massive collision and still managed to pull itself into a spherical shape but it is more than 7x larger than the potato radius, and orbits well further from a much smaller planet. So it stands to reason that such small moons orbiting so close to such a large planet would eternally show the aftereffects of ancient collisions.

[Libloather]

Is this where the octopuses came from?

https://nypost.com/2018/05/18/scientists-suggest-octopuses-might-actually-be-aliens/amp/