Gateway Engine

Each planet has a Gateway Engine located in the center of the planet. Once activated, like the Gateway Chambers, it has an Odd Stone to allow for teleportation between the Gateways and the Gateway Portal satellite. The engines can be found by digging to the center of any celestial body. The gateway engine has many tall purple towers coming out of it, with two that connect directly to its surface. The gateway engine will be locked and unable to be entered until at least one external gateway chamber on the surface has been activated.

Planets
Each Gateway Engine requires a specific resource to create a Geometric Triptych, which is required to activate the Engine. The Geometric Triptych is unique to each planet and can be created repeatedly. These Geometric Triptychs could be placed on the mysterious satellite orbiting the sun. If you collect all of the triptychs and place them in the corresponding slots on the satellite, you will be teleported somewhere unknown, and, as a result, end the game.