End of Chapter 12

End of Chapter 12 - End of Chapter 12 Study Guide...

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End of Chapter 12 Study Guide Exploration • Wonderful NASA missions: Pathfinder, Odyssey, Rovers . • these missions are able to accomplish almost every analytical function possible, short of bringing a rock back to Earth Orbit/Rotation • Many similarities to Earth - because of similar axis tilt (earth- 23.5, mars- 25), Mars has seasons like Earth - day is nearly the same length (24 hours and 40 minutes), years last 1.88 earth years - It is twice the diameter of Moon but only 53 percent Earth's diameter • Intermediate in size to Moon/Earth; because it's small, it must have cooled rapidly Atmosphere • Small planet means low escape velocity; volatiles that would be retained by Earth's atmosphere could not be retained on Mars • Mars has a secondary atmosphere (primary was H, etc.) whereas Earth has a tertiary atmosphere (because of biologic activity) • secondary atmospheres of Venus, Earth and Mars would all have been nearly identical composition (mostly CO2 because of volcanic emissions). • Clearly, Mars once had oceans, water erosion and weathering, thus it must have had a greenhouse. This was during the time of active volcanism, with more than enough volatiles being supplied to the atmosphere to compensate for the amount lost to space. The air on Mars is 95 percent carbon dioxide, with a few percent each of nitrogen and
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End of Chapter 12 - End of Chapter 12 Study Guide...

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