The Moon
In Sonic Adventure 2, Eggman and Shadow use the Eclipse Cannon, a superweapon developed by Gerald Robotnik, to destroy part of the moon. This is meant as a show of power to make the people of Earth surrender to Eggman’s rule. In Sonic 3, however, our heroes divert its aim away from Earth, so instead of a direct hit on the moon, the cannon slices off the southern end. It looks like the world is just gonna let it stay that way, too, as you can see the severed section hanging out in the moon’s orbit in the post-credits scene.
