Explanation: Deimos takes 30 hours and 18 minutes to orbit the Red Planet once. This is slightly longer than one Martian day, or sol, which is approximately 24 hours and 40 minutes. Therefore, Deimos drifts westward across the Martian sky. Though it is only about 15 kilometers across at its widest, the smallest of Mars’ two moons is bright. Deimos is actually the brightest celestial object in this Martian skyscape, which was captured before sunrise on March 1 (the 1,433rd sol of the Mars rover’s mission) by Perseverance. The image is composed of 16 exposures recorded by one of the rover’s navigation cameras. The individual exposures were combined into a single image to enhance the low-light view. Regulus and Algeiba, two bright stars in the constellation Leo, are also visible in the dark Martian predawn sky.