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Mars has two relatively small (compared to Earth's) natural moons, Phobos (about 22 kilometres (14 mi) in diameter) and Deimos (about 12 kilometres (7.5 mi) in diameter), which orbit close to the planet. The origin of both moons is unclear, although a popular theory states that they were asteroids captured into Martian orbit.
The total number of craters on Mars greater than 1 kilometre in diameter is approximately 385,000, with 21% of those (~85,000) being over 3 kilometers in diameter. [3] The number of craters on Mars over 25 metres in diameter is suggested to be approximately 90 million.
The relative sizes of and distance between Mars, Phobos, and Deimos, to scale (Load the image in full size to see both Moons of Mars.) March 5, 2024: NASA released images of transits of the moon Deimos , the moon Phobos and the planet Mercury as viewed by the Perseverance rover on the planet Mars.
Mars' size difference also affects the force on its surface. If you weighed 100 lbs on Earth, you would weigh only 38 lbs on Mars . Olympus Mons is a 68,897 ft high volcano that formed billions of ...
Size comparison between Phobos, Deimos and the Moon (right) Deimos is a gray-colored body. Like most bodies of its size, Deimos is highly non-spherical with triaxial dimensions of 16.1 km × 11.8 km × 10.2 km (10.0 mi × 7.3 mi × 6.3 mi), corresponding to a mean diameter of 12.5 km (7.8 mi) which makes it about 57% the size of Phobos. [7]
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Its orbit is so low that its angular diameter, as seen by an observer on Mars, varies visibly with its position in the sky. Seen at the horizon, Phobos is about 0.14° wide; at zenith , it is 0.20°, one-third as wide as the full Moon as seen from Earth .
It is very similar to the Mars Pathfinder in design and is approximately 2.65 meters (8.7 feet) in diameter and 1.6 m (5.2 ft) tall, including the entry vehicle (see below). The primary structure is aluminium with an outer ring of ribs covered by the solar panels, which are about 2.65 m (8.7 ft) in diameter.