Iosif Shklovsky suggested that it was both hollow and artificial, and it is seen as the most likely source of the Kaidun meteorite. The Stickney Crater is found on its surface, and the Soviet Union sent two probes to study it, but the first was lost en route, and radio communication was lost with the second, but not before taking several pictures of the surface. Features on this body are named for Asaph Hall, its discoverer, and Edouard Roche. Its orbit is reduced by about 2 meters per century, 
Iosif Shklovsky suggested that it was both hollow and artificial, and it is seen as the most likely source of the Kaidun meteorite. The Stickney Crater is found on its surface, and the Soviet Union sent two probes to study it, but the first was lost en route, and radio communication was lost with the second, but not before taking several pictures of the surface. Features on this body are named for Asaph Hall, its discoverer, and Edouard Roche. Its orbit is reduced by about 2 meters per century, FTP, identify this Martian moon, larger than its partner Deimos.
Iosif Shklovsky suggested that it was both hollow and artificial, and it is seen as the most likely source of the Kaidun meteorite.
{Phobos}