火星壁纸
by NASA/JPL-Caltech/Malin Space Science Systems/Texas A&M Univ.
NASA Image Library · 公有领域（Public Domain）
关于这张图
This image from NASA Mars rover Curiosity provides a comparison for how big the moons of Mars appear to be, as seen from the surface of Mars, in relation to the size that Earth moon appears to be when seen from the surface of Earth.
