21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 9, Problem 28QP
To determine
Reason why Mars and Venus were once more habitable but no longer are.
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Out of the inner planets in the solar system (Mercury, Venus and Mar) which do you think is the most likely to be colonized? Explain why?
Out of the inner planets in the solar system (Mercury,Venus and Mars), Which do you think is most likely to be colonized? Explain why?
Which of the following properties of Mars would be altered by the process of terraforming?
its size
its atmospheric chemistry
its distance from the Sun
its geological activity
its magnetic field
Even if we were to terraform Mars to give it an Earthlike climate, that climate would not be as stable as Earth's, due to Mars's lack of
a large moon
volcanic activity
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Chapter 9 Solutions
21st Century Astronomy
Ch. 9.1 - Prob. 9.1CYUCh. 9.2 - Prob. 9.2CYUCh. 9.3 - Prob. 9.3ACYUCh. 9.3 - Prob. 9.3BCYUCh. 9.4 - Prob. 9.4CYUCh. 9.5 - Prob. 9.5CYUCh. 9 - Prob. 1QPCh. 9 - Prob. 2QPCh. 9 - Prob. 3QPCh. 9 - Prob. 4QP
Ch. 9 - Prob. 5QPCh. 9 - Prob. 6QPCh. 9 - Prob. 7QPCh. 9 - Prob. 8QPCh. 9 - Prob. 9QPCh. 9 - Prob. 10QPCh. 9 - Prob. 11QPCh. 9 - Prob. 12QPCh. 9 - Prob. 13QPCh. 9 - Prob. 14QPCh. 9 - Prob. 15QPCh. 9 - Prob. 16QPCh. 9 - Prob. 17QPCh. 9 - Prob. 18QPCh. 9 - Prob. 19QPCh. 9 - Prob. 20QPCh. 9 - Prob. 21QPCh. 9 - Prob. 22QPCh. 9 - Prob. 23QPCh. 9 - Prob. 24QPCh. 9 - Prob. 25QPCh. 9 - Prob. 26QPCh. 9 - Prob. 27QPCh. 9 - Prob. 28QPCh. 9 - Prob. 29QPCh. 9 - Prob. 30QPCh. 9 - Prob. 31QPCh. 9 - Prob. 32QPCh. 9 - Prob. 33QPCh. 9 - Prob. 34QPCh. 9 - Prob. 35QPCh. 9 - Prob. 36QPCh. 9 - Prob. 37QPCh. 9 - Prob. 38QPCh. 9 - Prob. 39QPCh. 9 - Prob. 40QPCh. 9 - Prob. 41QPCh. 9 - Prob. 42QPCh. 9 - Prob. 43QPCh. 9 - Prob. 44QPCh. 9 - Prob. 45QP
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- Is it likely that life ever existed on either Venus or Mars? Justify your answer in each case.arrow_forwardHow could you argue that mars has now or has at some point in the past had an atmosphere and flowing liquid on the surface?arrow_forwardEarth's atmosphere contains just a small amount of carbon dioxide at the present time, because Earth's volcanoes did not outgas as much carbon dioxide as those on Mars and Venus Chemical reactions with other gases destroyed the carbon dioxide and replaced it with Nitrogen Carbon dioxide dissolves in water, and now most of it is contained in oceans and carbonate rocks Most of the carbon dioxide was lost during the 'heavy bombardment' phasearrow_forward
- What evidence is there that Venus was volcanically active about 300600 million years ago?arrow_forwardList several ways that Venus, Earth, and Mars are similar, and several ways they are different.arrow_forwardSuppose that, decades from now, NASA is considering sending astronauts to Mars and Venus. In each case, describe what kind of protective gear they would have to carry, and what their chances for survival would be if their spacesuits ruptured.arrow_forward
- Compare the current atmospheres of Earth, Venus, and Mars in terms of composition, thickness (and pressure at the surface), and the greenhouse effect.arrow_forwardWhat does a planet need in order to retain an atmosphere? How does an atmosphere affect the surface of a planet and the ability of life to exist?arrow_forwardWhat evidence can you give that Venus once had significant amounts of water? Where did that water come from? Where did it go?arrow_forward
- Describe the current atmosphere on Mars. What evidence suggests that it must have been different in the past?arrow_forwardOne source of information about Mars has been the analysis of meteorites from Mars. Since no samples from Mars have ever been returned to Earth from any of the missions we sent there, how do we know these meteorites are from Mars? What information have they revealed about Mars?arrow_forwardWhy do small planets cool faster than large planets? Choose any two of the five Terrestrial worlds and calculate for each one the ratio of its surface area to its volume. Why is this ratio important? (Hint: Does this ratio have anything to do with the ability of a planet to lose internal heat?) (Note: The surface area of a sphere is 4r2, and the volume of a sphere is 43r3.)arrow_forward
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