Titan, homeworld of the Eternals was just once a barren land mass. It is the biggest moon of Saturn, and second largest in the Milky Way. The Eternals first arrived when they had a conflict with the Kree armada. The Kree shot down the Eternals ship, forcing them to crash into Titan. From there on, the surviving Eternals formed a colony underground, then they employed artificial life systems. From then on, the Eternals made Titan a place of knowledge and meditation.