Groups comparison

Planet Earth (Terra) - 1970 to 2024
All or part of the story takes place on Earth of the Sol star system.

Space (Deep space) - 1970 to 2024
All or part of the story takes place in (deep) space. Either as is, on some form of a vessel, or artificial structure (such as a space station).

Extraterrestrial - 1971 to 2024
Set somewhere away from Earth, but still within the same universe where Earth actually exists or existed.

Future - 1971 to 2024
Set in the future, as seen from the point of the game's release.

Space aliens (Extraterrestrials) - 1971 to 2024
Features (sentient) extraterrestrial alien creatures.