Exam 2 Study Guide

Exam 2 Study Guide - Mars-results from spacecraft missions...

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Mars-results from spacecraft missions Mars has a lower pressure than it did before and water cannot remain Was warmer and wetter (means there was erosion, has carved channels) Little and weak atmosphere (used to have a thicker atmosphere) Too small to maintain internal heat Shows evidence of plate tectonics Change in magnetic field due to carbon dioxide loss Spirit and opportunity landers/rovers have observed these things from Mars Inverse Square Law: like gravity, the intensity of light seen at different distances from a source behaves according to the inverse square law (compares the intensity of sunlight from one planet to another), I/d2 (intensity/distance squared) Asteroids- What are they? Where are they? Composition Most asteroids lie in the asteroid belt between Mars and Jupiter, the Kuiper belt, and Oort Cloud Small bodies that are cratered and irregularly shaped Some have Earth-crossing orbits Chunk of metal and rock that orbits like a planet but is much smaller in size Galileo orbiter flew by and observed asteroids Jovian Planets- Jupiter, Saturn, Uranus, Neptune Jupiter: - largest and most massive planet - huge atmosphere (H, He, Methane, Ammonia, water vapor clouds) - Huge magnetic field - Great Red Spot: atmospheric feature, came from a storm - Circulation patters in the atmosphere, Galileo probe measured winds - Has a faint ring - Moons: o IO, has active volcanoes, tugged in opposite
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directions- this tidal action leads heating which leads to volcanic activity. o Europa: full of water, tidal heating keeps water liquid under a thin icy crust, asteroid, has freckles o Tidal forces make a moon active o Gravity causes distortion in planet (depends on distance, I=1/d2) o Saturn: - Rings (dust) seen by Galileo - Rings lie in the Roche limit (planet’s gravity tears apart a body like a moon or comet nucleus if it is within the limit). - Titan: has a volcano, flow features, coastline, liquid methane, has atmosphere Uranus/Neptune - Methane in the atmosphere - Absorb red light and reflect blue/green - Have rings and many moons BIGGER THAN TERESTRIAL PLANETS, HAVE MANY MOONS, RINGS, AND LOW DENSITIES Pluto: Why is it now classified as a dwarf planet? Looking for another planet to explain gravity Has three moons (but this doesn’t mean you’re a planet) Shares its orbit If it was discovered today, it would most likely be classified as a Kuiper Belt Object. Comets- what are they (sketch parts)? What happens during orbit? Why do meteor showers occur?
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This note was uploaded on 02/01/2011 for the course ASTR 101 taught by Professor Deming during the Spring '07 term at Maryland.

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Exam 2 Study Guide - Mars-results from spacecraft missions...

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