How many moons are there around Mars?
According to the book “The Solar System”, by Michael A. Seeds, Mars has two small moons: Phobos and Deimos. The first one measures 20km x 23km x 28km; the second one has a diameter of 12km. Deimos is 3 times more distant from Mars than Phobos ‘â€œ should it be observed from Mars, this moon would seem 15 times smaller in diameter than Earth’â„¢s moon.