Moons of Mars attention when Houston's claim was repeated in earnest by a Soviet scientist, Iosif Shklovsky, who, based on a later-disproven density estimate, suggested Phobos was a hollow metal shell. Searches have been conducted for additional satellites. In 2003, Scott S. Sheppard and David C. Jewitt surveyed nearly the entire Hill sphere of Mars for irregular satellites. However scattered light from Mars prevented them from searching the inner few arcminutes where the satellites Phobos and Deimos reside. No new satellites were found to an apparent limiting red magnitude of 23.5, which corresponds to radii of about 0.09 km using an albedo of
Mars One Chief Medical Officer Norbert Kraft, Mission Concept Artist Bryan Versteeg, Senior Marketing Strategist KC Frank, and Chief Information Officer Tom Van Braeckel. Mars One's team of advisers consists of over 30 industry and scientific experts, including Mason Peck, Peter Smith, James Kass, K.R. Sridhara Murthi, Esther Dyson, and Robert Zubrin. Mars One is not an aerospace company and will not manufacture hardware. Lansdorp assumes all major components are available in the aerospace market, and he thinks he has identified at least one potential supplier for each component of the mission. SpaceX mentioned that they had been contacted by Mars One,