Jupiter's moon Io, the most volcanically active world in the Solar System, has volcanic eruptions so powerful that they can be seen with large telescopes on Earth.
27. Moon has its own time zone called Lunar Time Zone and President Richard Nixon was one of the few to have a moon watch.
28. Pluto's largest moon Charon was named after astronomer James W. Christy's wife, Charlene. It was later discovered that Charon was an existing figure in Greek mythology (the ferryman of Hades, later known as Pluto), and thus the name was kept.
29. An asteroid impact may have caused Enceladus, Saturn's moon, to wobble and eventually stabilize at a tilt that is 55 degrees "off" from its original orientation.
30. Centaurs are small celestial bodies or minor planets that orbit the Sun between Jupiter and Neptune that have unstable orbits and act like asteroids or comets.
31(514107) 2015 BZ509
There is an asteroid ((514107) 2015 BZ509) orbiting Jupiter in retrograde i.e., the "wrong" direction. Some believe the asteroid is not native to our solar system.