Mars has two moons and the first who comprehended this was German astronomer and mathematician Johannes Kepler. He came to this discovery following his conviction that the was universe ruled by numerological regularity. Earth has one moon, and in his era were known for only four of Jupiter's moon. As the Mars path located between the Earth and Jupiter, Kepler concluded that Mars must have two moons. This would form a simple geometric series: one, two, four ...
Not even a century later binoculars were not yet strong enough to detect these tiny Phobos and Deimos, but the Irish writer Jonathan Swift in Gulliver famous voyages gave them details about the astounding accuracy.
Gulliver, in fact, astronomers of floating island of Laputa said they had discovered two satellites of Mars, which are remote from the center of the planet three or five of its diameter.
After Kepler, the more zealous observer sky was wrongly claimed to have observed the Mars moons. Mars children, Fear and Panic,in 1877th discovered American astronomer Asaph Hall, and how they look, we learned a hundred years later, the photos made spacecraft Mariner 9 and Viking 1.NASA rovers Spirit and Opportunity were observed Phobos and Deimos in an entirely new way. They were, in fact, recorded during their passage across the Solar disk during the eclipse or transit. With all his uncanny perspicacity and imagination, something about this, neither Kepler nor Swift could not even dream of!
Because they reflect very little sunlight they are among the darkest bodies of the Solar System. These small satellites have a lower density of Mars, and both have lots of craters. Moons circling the planet in the eastern direction. Their diameter at the widest places is 26 km for Phobos and 16 km for Deimos.