However, the moons' near circular orbits and low inclination relative to the Martian equator are not in agreement with the capture hypothesis.[1] The detection of minerals on Phobos similar to those in the Martian lithosphere, and the unusually low density and high porosity of Phobos, such that the moon would not be expected to remain aggregate if dynamically captured, suggest that the moons could have formed via accretion in Martian orbit, similar to how Earth's Moon formed.[8]