Moons of Mars binary asteroid that separated under tidal forces. Phobos could be a second-generation Solar System object that coalesced in orbit after Mars formed, rather than forming concurrently out of the same birth cloud as Mars. Another hypothesis is that Mars was once surrounded by many Phobos- and Deimos-sized bodies, perhaps ejected into orbit around it by a collision with a large planetesimal. The high porosity of the interior of Phobos (based on the density of 1.88 g/cm, voids are estimated to comprise 25 to 35 percent of Phobos' volume) is inconsistent with an asteroidal origin. Observations of Phobos in the thermal
Mars One development or any contracts in place with companies that could provide a spacecraft or rocket. While plans point to SpaceX for both resources, the company has no contracts with Mars One in an industry that typically plans contracts decades in advance. Mars One Mars One is a small private Dutch organization that proposed in 2012 to land the first humans on Mars and leave them there to establish a permanent human colony in the coming decades. Mars One is not an aerospace company and will not manufacture hardware. Mars One consists of two entities: the not-for-profit "Mars One Foundation", and