Alexandria, the ancient city of Pyramids on Mars circa 1144 AD

Science fiction writer have long suggested that there was once life on the desert planet of Mars. Stargate SG-1 and other television shows and movies have suggested that space aliens built the pyramids on Earth and perhaps seeded intelligent here thousands of years ago. Perhaps they left here and went to Mars a thousand years ago and established a colony under gradually worsening weather conditions and they were subject to falling meteors that may have led to the colony's end five hundred years ago.