Spaceship Galileo is going to fly by one of Jupiter's tinier moons, Almathea. it's about 135 km long (84 miles).
AFAIK Galileo does not resemble a monolith. But I remember reading that if it finds intelligent life, it will try to sell hair-loss prevention to it. http://www.space.com/scienceastronomy/solarsystem/almathea_flyby_020925.html
amalthea_voyager_020926_01.jpga
Description: Binary data
