EBK FOUNDATIONS OF ASTRONOMY
14th Edition
ISBN: 8220106820612
Author: Backman
Publisher: YUZU
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Chapter 20, Problem 25RQ
What evidence can you give that Mercury had volcanism? Does Mercury have volcanism today? How do you know?
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In 2015, researchers concluded that Enceladus's subsurface ocean is probably global, instead of just being restricted to the south polar region. What had the Cassini spacecraft found, that led them to their conclusion?
a Enceladus wobbles slightly as it orbits Saturn, more so than it could if its ice shell were mostly frozen to the rocky interior.
b Enceladus is absorbing so much water (which is ejected by Saturn from its atmosphere) that there must be a global ocean under its icy surface.
c The number of large, lava-spewing volcanoes on Enceladus's surface is so high that they can only be the result of liquid water under the whole surface.
d The magnetic field of Enceladus is so strong that it can only be explained by a global ocean of salty water under the surface.
Hellas Planitia includes the word "planitia" which is the latin word for "plain" in its name.
The name would seem to indicate thats Hellas Planitia is a low lying plain, yet it is clearly a crater, and a very large one at that.
The most probable reason for this discrepancy in its name is because:
a. It is a simple naming error that for some reason has so far escaped correction.
b. There is a disagreement among astronomers about the true nature of Hellas Planitia.
c. Its true nature was not apparent over 100 years ago when it was observed using ground based telescopes.
d. Astronomers really know its true nature and misconceptions among the public among the public are not of great concern to them.
If we moved Venus out to 1 AU from the Sun (same as Earth), Venus would probably
a.
become more like Earth, with oceans and a temperate climate
b.
remain hot, dry, and dead because it's permanently lost its oceans
c.
become more like Mars, losing most of its atmosphere and freezing
d.
become much less geologically active due to decreased solar heating
Chapter 20 Solutions
EBK FOUNDATIONS OF ASTRONOMY
Ch. 20 - How does the force of gravity cause tidal coupling...Ch. 20 - As viewed from Earth, how many times does the Moon...Ch. 20 - If the Moon is tidally coupled to Earth, is Earth...Ch. 20 - How can you determine the relative ages of the...Ch. 20 - From looking at images of the Moons near side, how...Ch. 20 - Why did the first Apollo missions land on the...Ch. 20 - Why do planetary scientists hypothesize that the...Ch. 20 - Prob. 8RQCh. 20 - Prob. 9RQCh. 20 - Prob. 10RQ
Ch. 20 - What is the most significant kind of erosion that...Ch. 20 - Provide evidence to support a hypothesis about...Ch. 20 - What evidence can you cite that the Moon had...Ch. 20 - What evidence would you expect to find on the Moon...Ch. 20 - How does the large-impact hypothesis explain the...Ch. 20 - Look at the Celestial Profiles for Earth, the...Ch. 20 - Look at the Celestial Profiles for the Moon and...Ch. 20 - Prob. 18RQCh. 20 - Look at the Celestial Profiles for Earth, the...Ch. 20 - Look at the Celestial Profiles for the Moon and...Ch. 20 - Why are features like the Moons maria not observed...Ch. 20 - What are the relative ages of the intercrater...Ch. 20 - What evidence can you give that Mercury has a...Ch. 20 - Why is it not surprising that there is no evidence...Ch. 20 - What evidence can you give that Mercury had...Ch. 20 - How are the histories of the Moon and Mercury...Ch. 20 - What property of the Moon and Mercury has resulted...Ch. 20 - Prob. 28RQCh. 20 - Look at the right top and bottom images in Figure...Ch. 20 - Calculate the escape velocity of the Moon from its...Ch. 20 - Prob. 3PCh. 20 - Why do small planets cool faster than large...Ch. 20 - The smallest detail visible through Earth-based...Ch. 20 - Prob. 6PCh. 20 - The trenches where Earths seafloor slips downward...Ch. 20 - An Apollo command module orbited the Moon about...Ch. 20 - Prob. 9PCh. 20 - What is the angular diameter of Mercury when it is...Ch. 20 - If you transmit radio signals to Mercury when...Ch. 20 - What is the wavelength of the most intense...Ch. 20 - Suppose you send a probe to land on Mercury, and...Ch. 20 - The smallest detail visible through Earth-based...Ch. 20 - Prob. 1SOPCh. 20 - Prob. 2SOPCh. 20 - Look at the image of the astronaut on the Moon at...Ch. 20 - In the photo shown here, astronaut Alan Bean works...Ch. 20 - Examine the shape of the horizon at the Apollo 17...
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- What is the smallest-diameter crater you can identify in the photo of Mercury in Figure 2 of the Concept Art: Terrestrial and Jovian Planets? (Hint: See Appendix Table A-10, Properties of the Planets, to find the radius of Mercury in kilometers for scale.)arrow_forwardDoes Titan experience volcanism today? Impact cratering? How do you know?arrow_forwardWe believe that chains of comet fragments like Comet Shoemaker-Levy 9’s have collided not only with the jovian planets, but occasionally with their moons. What sort of features would you look for on the outer planet moons to find evidence of such collisions? (As an extra bonus, can you find any images of such features on a moon like Callisto? You can use an online site of planetary images, such as the Planetary Photojournal, at photojournal.jpl.nasa.gov.)arrow_forward
- Describe two anomalous features of the rotation of Venus and what might account for them.arrow_forwardDoes Venuss surface experience meteorite impacts today? How do you know?arrow_forwardUse the information in Appendix G to calculate what you would weigh on Titan, Io, and Uranus’ moon Miranda.arrow_forward
- Does Marss surface experience any meteorite impacts today? How do you know?arrow_forwardWhy do astronomers conclude that the surface of Mercury, shown in Figure UN 15-4, is old? When did the majority of those craters form?arrow_forwardCalculate how many Earths would fit into the volumes of Saturn, Uranus, and Neptune.arrow_forward
- The Pioneer Venus orbiter circled Venus with a period of 24 hours. What was its average distance above the surface of Venus? (Hints: Use the formula for circular velocity, Eq. 5-1a. Remember to convert quantities to kg, m, and s.) (Note: Necessary data are given in Celestial Profile: Venus.)arrow_forwardWhat is the orbital velocity of Miranda around Uranus? (Hint: Use the formula for circular velocity, Eq. 5-1a. The formula requires input quantities in kg and m.) (Note: Necessary data are given in Celestial Profile: Uranus and Appendix Table A-11.)arrow_forwarda) What are the characteristics of a terrestrial planet? b) What are the characteristics of aJovian planet?arrow_forward
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