1. Copyright © 2010 Pearson Education, Inc. Clicker Questions Chapter 8 Moons, Rings, and Plutoids

2. Copyright © 2010 Pearson Education, Inc. As their distance from Jupiter increases, the four Galilean satellites show a consistent Question 1 a) increase in density. b) increase in size. c) decrease in cratering. d) decrease in density. e) amount of cratering.

3. Copyright © 2010 Pearson Education, Inc. As their distance from Jupiter increases, the four Galilean satellites show a consistent Question 1 a) increase in density. b) increase in size. c) decrease in cratering. d) decrease in density. e) amount of cratering. Like a miniature version of our solar system, Jupiter’s four large moons show a decrease in density as distance increases. Io is most dense of the four; Callisto is least dense.

4. Copyright © 2010 Pearson Education, Inc. The surface of which jovian moon most resembles the pack ice of the Arctic Ocean? Question 2 a) Europa b) Io c) Amalthea d) Ganymede e) Callisto

5. Copyright © 2010 Pearson Education, Inc. The surface of which jovian moon most resembles the pack ice of the Arctic Ocean? Question 2 Ice-filled surface cracks indicate an ocean may lie below. a) Europa b) Io c) Amalthea d) Ganymede e) Callisto

6. Copyright © 2010 Pearson Education, Inc. What is thought to cause Io’s volcanism? Question 3 a) Jupiter’s magnetosphere b) Jupiter’s rapid rotation c) tidal stress from Jupiter and Europa d) radioactive decay from its core e) Io’s large mass and tectonic activity

7. Copyright © 2010 Pearson Education, Inc. What is thought to cause Io’s volcanism? Question 3 a) Jupiter’s magnetosphere b) Jupiter’s rapid rotation c) tidal stress from Jupiter and Europa d) radioactive decay from its core e) Io’s large mass and tectonic activity Io is constantly “squeezed” by its huge neighbor as well as by companion moons, heating its interior.

8. Copyright © 2010 Pearson Education, Inc. How was the ring of Jupiter discovered? Question 4 a) by optical telescopic observers from Earth b) by Voyager I as it passed Jupiter c) by an occultation of a star d) by radar imaging using the Arecibo dish e) with the Hubble Space Telescope’s superior resolution

9. Copyright © 2010 Pearson Education, Inc. How was the ring of Jupiter discovered? Question 4 a) by optical telescopic observers from Earth b) by Voyager I as it passed Jupiter c) by an occultation of a star d) by radar imaging using the Arecibo dish e) with the Hubble Space Telescope’s superior resolution Jupiter’s ring is composed of dark, dusty particles that were first seen when Voyager was past the planet, looking back toward the Sun.

10. Copyright © 2010 Pearson Education, Inc. The Roche limit is defined as the critical Question 5 a) distance from a planet, inside of which a moon can be tidally destroyed. b) density that a moon can have and be solid. c) distance from a planet that a moon can experience synchronous rotation. d) mass a moon can have and still be classified as a moon.

11. Copyright © 2010 Pearson Education, Inc. The Roche limit is defined as the critical Question 5 a) distance from a planet, inside of which a moon can be tidally destroyed. b) density that a moon can have and be solid. c) distance from a planet that a moon can experience synchronous rotation. d) mass a moon can have and still be classified as a moon. Saturn’s rings, as well as those of the other jovian planets, lie within its planet’s Roche limit.

12. Copyright © 2010 Pearson Education, Inc. Shepherd satellites are defined as Question 6 a) satellites in the coma of a comet. b) moons that confine a narrow ring. c) a type of moon that orbits another moon. d) moons that share an orbit of another, larger moon. e) moons that orbit inside a system of rings.

13. Copyright © 2010 Pearson Education, Inc. Shepherd satellites are defined as Question 6 a) satellites in the coma of a comet. b) moons that confine a narrow ring. c) a type of moon that orbits another moon. d) moons that share an orbit of another, larger moon. e) moons that orbit inside a system of rings.

14. Copyright © 2010 Pearson Education, Inc. Why are the rings of Saturn so bright? Question 7 a) They are made of frozen metallic hydrogen. b) They contain glassy beads expelled by volcanoes on Enceladus. c) They contain shiny bits of iron. d) Titan and other moons reflect additional glow onto the rings. e) They are made of relatively new ice.

15. Copyright © 2010 Pearson Education, Inc. Why are the rings of Saturn so bright? Question 7 a) They are made of frozen metallic hydrogen. b) They contain glassy beads expelled by volcanoes on Enceladus. c) They contain shiny bits of iron. d) Titan and other moons reflect an additional glow onto the rings. e) They are made of relatively new ice. Saturn’s rings are perhaps only 50 million years old, the result of a small moon coming within the planet’s Roche limit.

16. Copyright © 2010 Pearson Education, Inc. Question 8 a) our Moon b) Phobos c) Europa d) Titan e) Triton Which moon in the solar system shows a dense atmosphere?

17. Copyright © 2010 Pearson Education, Inc. Question 8 a) our Moon b) Phobos c) Europa d) Titan e) Triton Which moon in the solar system shows a dense atmosphere? The Huygens probe, deployed by the Cassini spacecraft in 2005, showed that Titan’s atmosphere has a complex organic chemistry.

18. Copyright © 2010 Pearson Education, Inc. Which of the Uranian moons displays the widest range of surface terrains, suggesting some catastrophic disruption? Question 9 a) Puck b) Umbriel c) Oberon d) Miranda e) Ariel

19. Copyright © 2010 Pearson Education, Inc. Which of the Uranian moons displays the widest range of surface terrains, suggesting some catastrophic disruption? Question 9 a) Puck b) Umbriel c) Oberon d) Miranda e) Ariel

20. Copyright © 2010 Pearson Education, Inc. The rings of Neptune Question 10 a) were confirmed by Voyager 2 in 1989. b) appear both narrow and diffuse. c) all lie within Neptune’s Roche limit. d) often appear as clumpy ring arcs, rather than complete and symmetrical rings. e) All of these are correct.

21. Copyright © 2010 Pearson Education, Inc. The rings of Neptune Question 10 a) were confirmed by Voyager 2 in 1989. b) appear both narrow and diffuse. c) all lie within Neptune’s Roche limit. d) often appear as clumpy ring arcs, rather than complete and symmetrical rings. e) All of these are correct.

22. Copyright © 2010 Pearson Education, Inc. Neptune’s moon Triton shows Question 11 a) a thick atmosphere similar to Titan. b) volcanic features similar to those on Io. c) cratering similar to that of Callisto. d) large cliffs similar to Miranda. e) All of the above are correct.

23. Copyright © 2010 Pearson Education, Inc. Neptune’s moon Triton shows Question 11 a) a thick atmosphere similar to Titan. b) volcanic features similar to those on Io. c) cratering similar to that of Callisto. d) large cliffs similar to Miranda. e) All of the above are correct. Triton has a thin atmosphere, active geysers of nitrogen gas, large fissures, and frozen lakes of water ice.

24. Copyright © 2010 Pearson Education, Inc. Question 12 a) a cold terrestrial planet. b) a small jovian planet. c) a large Kuiper belt object. d) a wandering moon. e) a captured comet. Many astronomers believe Pluto is perhaps best classified as

25. Copyright © 2010 Pearson Education, Inc. Many astronomers believe Pluto is perhaps best classified as Question 12 a) a cold terrestrial planet. b) a small jovian planet. c) a large Kuiper belt object. d) a wandering moon. e) a captured comet. Several other large Kuiper belt objects have been discovered, including the largest known, called Eris.

26. Copyright © 2010 Pearson Education, Inc. Which of these moons are most exciting to exobiologists? Question 13 a) Io and Enceladus b) Titan and Europa c) Titan and Triton d) Europa and Miranda e) Phobos and Deimos

27. Copyright © 2010 Pearson Education, Inc. Which of these moons are most exciting to exobiologists? Question 13 a) Io and Enceladus b) Titan and Europa c) Titan and Triton d) Europa and Miranda e) Phobos and Deimos Europa has indications of liquid water beneath the ice. Titan shows evidence of channels under its dense atmosphere.