Planet's Edge is a 1992 space science fiction role-playing video game developed by New World Computing with Eric Hyman as the lead designer. The game's plot centers on investigating the sudden disappearance of planet Earth, by venturing out into the universe from a moon base. There are two main play modes: real-time exploration and combat using various spacecraft, and turn-based exploration, problem solving, and combat on the surface of dozens of planets. The game features a variety of objects, weapons, and missions, though it lacks any detailed experience or stats system for the four characters the player controls.
Just prior to the start of the game, a mysterious alien spaceship approaches the Earth to conduct an experiment which goes terribly wrong and causes the Earth to disappear into a wormhole trap. A scientific research team based on the Moon determines that the only way to bring the Earth and all its inhabitants back involves recreating this failed experiment. Unfortunately, the experimental apparatus, called the Centauri Drive, has been destroyed in this accident. Nonetheless, Moonbase scientists are able to salvage enough technology from the wrecked alien craft to construct their own rudimentary spaceship. A four member scientific team commanded by the player is put together to find and obtain the parts necessary to rebuild the Centauri Drive and thereby save the Earth. This is the primary goal of the game.
The story begins in our solar system, but the fictional setting encompasses over a hundred stars and their associated planets and civilizations in the surrounding galaxy. The game world divides the interstellar space surrounding the Sun into eight sectors characterized by particular alien civilizations possessing varying degrees of technological sophistication. Each of the eight sectors is associated with a particular subplot which must be solved in order to gain access to each of the eight pieces necessary to complete the construction of the Centauri Drive.
Source: Wikipedia, "Planet's edge", available under the CC-BY-SA License.