UT Arlington ASTR 1345 - Final Exam Study Guide (5 pages)

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Final Exam Study Guide

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Final Exam Study Guide


Goes through lectures 20-23

Study Guide
University of Texas at Arlington

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ASTR 1345 1st Edition Exam 4 Study Guide Lectures 20 23 Lecture 20 November 13 Mercury Venus Mars What do we know about Mercury Mercury is 20 the size of the Earth and has extreme variations in temperature Mercury has no seasons and there are traces of an atmosphere Mercury is filled with subtle blue and red areas and wrinkle like ridges are an indication that Mercury is shrinking It has active volcanoes and a magnetic field What is the Caloris Basin Caloris Basin is found on Mercury and it is a crater of about 800 miles in diameter It was probably formed by a major impact that occurred early on and shock waves from the impact produced a hilly landscape on the opposite side of the planet What do we know about Venus Venus is about the same size as Earth and has a runaway greenhouse effect caused by its dense toxic atmosphere which is hot enough to melt iron Venus has no magnetic field and only the Moon outshines Venus because of its proximity There are a lot of lava plains and the surface temperature is 750K at all times and latitudes What do we know about Mars Mars is half the size of Earth and contains the highest mountain and the deepest and longest valley Because of its smaller size the interior f Mars cooled faster than Earth s so surface activity has ceased Mars sky is red due to fine iron oxide rust There are multiple indications that Mars once had water Lecture 21 November 18 Space Missions and Jupiter What are Mars moons Mars has 2 small moons named Phobos and Deimos discovered in 1877 by Asaph Hall Phobos is potato shaped and its period of 5 hours means it orbits faster than Mars rotates so it moves west to east across the sky It is now believed that this moon is more like a pile of rubble Deimos moves from east to west across the sky in about 3 Earth days What happened with Voyager 1 and Voyager 2 Voyager 1 and 2 each reached Jupiter in 1979 Saturn gave Voyager 1 a gravitational slingshot out of the Solar System Voyager 2 used Saturn s gravity to propel it

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