THEMIS Takes Deimos’ Temperature

Can you feel the heat? NASA’s Mars Odyssey can see it! This is an image of Mars’ smaller moon Deimos, captured with Odyssey’s THEMIS (Thermal Emission Imaging System) instrument on Feb. 15, 2018. Part of the 7-mile-wide Moon was in shadow, but the sunlit surface area reached temperatures up to 200 K (that’s still pretty…

These Are Our Best Pictures of Mars’ Smallest Moon

Mars isn’t a planet well-known for its natural satellites but it actually does have two small moons. The larger, Phobos, is an irregularly-shaped, heavily grooved and cratered world only about 17 miles (27 km) across at its widest. It orbits Mars so closely that it completes 3 orbits every day, and isn’t even visible from…

Fear and Dread

The European Space Agency’s Mars Express has captured footage of Mars’ two tiny moons, Phobos and Deimos, passing each other in what is known as a “mutual event”. Although the moons themselves are in no special positions the images are noteworthy, being the first time the moons have been photographed passing each other. Mars Express’…

Deimos Rising

  Released today, this photo from the HiRISE camera aboard the MRO shows the smooth face of Deimos, Mars’ smaller moon. (Its larger brother is Phobos, also photographed by the HiRISE in 2008.) Its surface is covered by a fine layer of rocky soil, called regolith, which gives it its smooth texture. Deimos is only…