Mars Basics
Size & Distance Smaller than Earth (0.532x) Mars diam ~ 6779 km (4212 miles) Earth diam ~ 12,742 km (7918 miles) 8 Mars would fit inside the Earth!
Size & Distance
Smaller than Earth (0.532x) Mars diam ~ 6779 km (4212 miles) Earth diam ~ 12,742 km (7918 miles) 8 Mars would fit inside the Earth! 1.5 AU from the sun (~140 million miles) 0.5 AU from the Earth (~43 million miles) SCALE!!!
Scale Using a 12-inch Earth globe and 6-inch Mars globe as a scale: Q: How far away do you think Mars would be? A: 1.4 km (~0.87 miles)
LPI McDonald’s
Rotation & Revolution One Martian day (sol) is 24 hours and 37 minutes One Martian year is 687 Earth days, almost two Earth years
Seasons Like Earth, Mars tilts This tilt contributes to seasons, orbit also contributes
Atmosphere Yep. Mars has an atmosphere. ~95% CO 2, ~3% N 2, ~2% Ar; traces of O 2, CO Surface pressure ~0.006 atm (~1/100 th Earth’s atmosphere) Gerard Kuiper made spectroscopic observations of CO 2 in the atmosphere in 1952; presumed to be a minor constituent until 1965
Interior Core, mantle, crust No magnetic field today; data support one in the past
Mars is Cold Average temp: -63° C (max & min vary) Weirdness above the surface…
Deimos – 15 km (9.3 miles) Phobos – 26.8 km (16.7 miles) Moons