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Mars Basics

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. Size & Distance. Smaller than Earth (0.532x) Mars diam ~ 6779 km (4212 miles)

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Mars Basics

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  1. Mars Basics

  2. 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!

  3. Size & Distance

  4. 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!!!

  5. 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)

  6. LPI McDonald’s

  7. Rotation & Revolution • One Martian day (sol) is 24 hours and 37 minutes • One Martian year is 687 Earth days, almost two Earth years

  8. Seasons • Like Earth, Mars tilts • This tilt contributes to seasons, orbit also contributes

  9. Atmosphere • Yep. Mars has an atmosphere. • ~95% CO2, ~3% N2, ~2% Ar; traces of O2, CO • Surface pressure ~0.006 atm (~1/100th Earth’s atmosphere) • Gerard Kuiper made spectroscopic observations of CO2 in the atmosphere in 1952; presumed to be a minor constituent until 1965

  10. Interior • Core, mantle, crust • No magnetic field today; data support one in the past

  11. Mars is Cold • Average temp: -63° C (max & min vary) • Weirdness above the surface…

  12. Moons Deimos – 15 km (9.3 miles) Phobos – 26.8 km (16.7 miles)

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