Some conspiracy theorists claim that there have been in the past and currently are civilizations on Mars. There is said to be human-like extraterrestrials who inhabited the planet long ago and have used Mars as a base for some time. People point out that there are many underground tunnels and cities on Mars, similar to Earth, where these beings are said to live.

It is also said that the United States government has the technology to travel to Mars and that they have secretly taken humans from planet earth over to Mars since the late 60's. It is said that Mars has is very much like Earth and not as red as commonly portrayed on the surface. Vegetation is said to be scarce on the moon and therefore there is not much oxygen on the surface so it is very hard to breathe without assistance.