Maybe Mimas is solid, but its core is irregular, like the shape of many asteroids.
Mimas always presents the same face to Saturn, just as the Moon does to Earth.
However, both the Moon and Mimas experience libration wobbling slightly and bringing part of the “far side” into view.
The final guess is also eminently reasonable: Mimas might have a partly liquid interior.
The authors of the new study used data from the Cassini probe orbiting Saturn to measure the libration of Mimas.
Our grand finale: landing on Mimas with Saturn rising spectacularly out of the east.
Mimas is in the plane of the rings, so they couldn't be obvious.
They were the shadows of Mimas, Enceladus, and Tethys, the three inner satellites.
Mimas had no atmosphere—how could the meteor sound off or burn up?
Between Erythræ and Hypocremnus is Mimas,77 a lofty mountain, abounding with beasts of chase, and well wooded.