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
Two Moons Two Moons Two Moons (1847–1917), or "Ishaynishus" (Cheyenne: "Éše'he Ôhnéšesêstse"), was one of the Cheyenne chiefs who took part in the Battle of the Little Bighorn and other battles against the United States Army. Two Moons was the son of Carries the Otter, an Arikara captive who married into the Cheyenne tribe. Perhaps known best for his participation in battles such as the Battle of the Rosebud against General Crook on June 17, 1876, in the Montana Territory, the Battle of Little Big Horn on June 25, 1876 and what would prove to be his last battle, the Battle of