Mars has a planet of great interest to astronomers for decades because of the possiblity that it supported life. Scientists says that Mars was very earthlike and contained liquid H2O. The best evidence of this is on the north and south poles of Mars where there are ice caps. The most famous evidence of Mar's life supporting past was fossils of what appeared to be microorganisms. Because of this scientists belive Mars could be suitable for human colonization when can no longer be able to support life.