MSF is a postulated science fiction subgenre:60 that exists between science fiction and the mainstream. According to the Manifesto, MSF writers believe it is unlikely that alien intelligence will overcome the physical constraints on interstellar travel any better than we can. As such, the Manifesto imagines a future on Earth and within the Solar System. The Manifesto states that alternative universes, parallel worlds, magic and the supernatural (including telepathy and telekinesis), time travel and teleportation are similarly avoided. MSF rarely involves interstellar travel or communication with alien civilization. In the MSF ethos, unfounded speculation about interstellar travel can lead to an illusion of a universe abundant with planets as hospitable to life as Earth, which encourages wasteful attitude to the abundance on Earth. MSF thus focuses on stories set on or near the Earth, with a believable use of technology and science as it exists at the time the story is written or which is a plausible extension of existing technology. MSF works explore topics such as enhanced genomes, environmental degradation, nanotechnology, quantum mechanics, robotics, and virtual reality. MSF claims to describe change “already in effect” and claims “ideological significance”.