The Space Colony ARK is a location that appears in the Sonic the Hedgehog comic series and its spin-offs published by IDW Publishing. It is a space station that is in orbit around the world, and is notable for being home to the powerful Eclipse Cannon.
In the past, the Space Colony ARK was used by Dr. Eggman as a base of operations for one of his attempts at world domination. During this time, to demonstrate the ARK's power, he fired the Eclipse Cannon at the moon, which reduced half of its surface to rubble. Eventually however, the ARK threatened to destroy the planet, forcing Eggman to team up with Sonic, Tails, Knuckles and Rouge (who had all made it onboard the ARK) to save the world.