A staff restaurant outcome erythromycin stearate 250 mg pregnancy guide The MAVEN mission will explore the evolution of the Martian atmosphere, and will probe whether its cold, thin, dry shell of air was once thick and ideal for microbial life. In its elliptical orbit, it will swoop down to just 77 miles above the surface to taste each layer of the top of the atmosphere and then get a bird's eye view of the entire planet at its highest point, 3,728 miles above the planet.