Olympus Mons

Olympus Mons is an extinct volcano on Mars. It’s the tallest mountain in the Solar System. This picture of the mountain was taken recently by the Indian Space Research Organization’s Mars Orbiter from an altitude of  8,387 km. The arrow indicates the summit which rises about 21 km above the mean surface level, so high that it’s effectively above the atmosphere. The white area around the mountain is a cloud formation.

Image Credit: ISRO

THEMIS, Deimos, and Phobos

These images of Phobos and Deimos, the moons of Mars, were taken by the Mars Odyssey orbiter’s THEMIS (Thermal Emission Imaging System) camera using visible-wavelength light. The apparent motion of the moon caused by the camera’s point-of-aimaim being moved during the 17-second span of the observation.

The distance to Phobos from Odyssey during the observation was about 5,600 km. The Deimos was almost 20,000 km away.

Image Credit: NASA