Astronomy A BEGINNER’S GUIDE TO THE UNIVERSE EIGHTH EDITION CHAPTER Moons, Rings, and Plutoids Clickers © 2017 Pearson Education, Inc Question As their distance from Jupiter increases, the four Galilean satellites show a consistent a) b) c) d) e) © 2017 Pearson Education, Inc increase in density increase in size decrease in cratering decrease in density amount of cratering Question As their distance from Jupiter increases, the four Galilean satellites show a consistent a) b) c) d) e) increase in density increase in size decrease in cratering decrease in density amount of cratering Explanation: 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 © 2017 Pearson Education, Inc Question The surface of which jovian moon most resembles the pack ice of the Arctic Ocean? a) b) c) d) e) © 2017 Pearson Education, Inc Europa Io Amalthea Ganymede Callisto Question The surface of which jovian moon most resembles the pack ice of the Arctic Ocean? a) b) c) d) e) Europa Io Amalthea Ganymede Callisto Explanation: Ice-filled surface cracks indicate an ocean may lie below © 2017 Pearson Education, Inc Question What is thought to cause Io’s volcanism? a) b) c) Jupiter’s magnetosphere Jupiter’s rapid rotation Tidal stress from Jupiter and Europa d) Radioactive decay from its core e) Io’s large mass and tectonic activity © 2017 Pearson Education, Inc Question What is thought to cause Io’s volcanism? a) b) c) Jupiter’s magnetosphere Jupiter’s rapid rotation Tidal stress from Jupiter and Europa d) Radioactive decay from its core e) Io’s large mass and tectonic activity Explanation: Io is constantly “squeezed” by its huge neighbor as well as by companion moons, heating its interior © 2017 Pearson Education, Inc Question How was the ring of Jupiter discovered? a) By optical telescopic observers from Earth b) By Voyager I as it passed Jupiter c) d) By an occultation of a star By radar imaging using the Arecibo dish e) © 2017 Pearson Education, Inc With the Hubble Space Telescope’s superior resolution Question How was the ring of Jupiter discovered? a) By optical telescopic observers from Earth b) By Voyager I as it passed Jupiter c) d) By an occultation of a star By radar imaging using the Arecibo dish e) With the Hubble Space Telescope’s superior resolution Explanation: Jupiter’s ring is composed of dark, dusty particles that were first seen when Voyager was past the planet, looking back toward the Sun © 2017 Pearson Education, Inc Question The Roche limit is defined as the critical a) b) c) distance from a planet, inside of which a moon can be tidally destroyed density that a moon can have and be solid distance from a planet that a moon can experience synchronous rotation d) mass a moon can have and still be classified as a moon © 2017 Pearson Education, Inc Question Why are the rings of Saturn so bright? a) They are made of frozen metallic hydrogen b) They contain glassy beads expelled by volcanoes on Enceladus c) d) They contain shiny bits of iron Titan and other moons reflect an additional glow onto the rings e) They are made of relatively new ice Explanation: Saturn’s rings are perhaps only 50 million years old, the result of a small moon coming within the planet’s Roche limit © 2017 Pearson Education, Inc Question Which moon in the solar system shows a dense atmosphere? a) b) c) d) e) © 2017 Pearson Education, Inc Our Moon Phobos Europa Titan Triton Question Which moon in the solar system shows a dense atmosphere? a) b) c) d) e) Our Moon Phobos Europa Titan Triton Explanation: The Huygens probe, deployed by the Cassini spacecraft in 2005, showed that Titan’s atmosphere has a complex organic chemistry © 2017 Pearson Education, Inc Question Which of the Uranian moons displays the widest range of surface terrains, suggesting some catastrophic disruption? a) b) c) d) e) © 2017 Pearson Education, Inc Puck Umbriel Oberon Miranda Ariel Question Which of the Uranian moons displays the widest range of surface terrains, suggesting some catastrophic disruption? a) b) c) d) e) © 2017 Pearson Education, Inc Puck Umbriel Oberon Miranda Ariel Question 10 The rings of Neptune a) b) c) d) e) © 2017 Pearson Education, Inc were confirmed by Voyager in 1989 appear both narrow and diffuse all lie within Neptune’s Roche limit often appear as clumpy ring arcs, rather than complete and symmetrical rings All of these are correct Question 10 The rings of Neptune a) b) c) d) e) © 2017 Pearson Education, Inc were confirmed by Voyager in 1989 appear both narrow and diffuse all lie within Neptune’s Roche limit often appear as clumpy ring arcs, rather than complete and symmetrical rings All of these are correct Question 11 Neptune’s moon Triton shows a) b) c) d) e) © 2017 Pearson Education, Inc a thick atmosphere similar to Titan volcanic features similar to those on Io cratering similar to that of Callisto large cliffs similar to Miranda All of the above are correct Question 11 Neptune’s moon Triton shows a) b) c) a thick atmosphere similar to Titan volcanic features similar to those on Io cratering similar to that of Callisto d) e) large cliffs similar to Miranda All of the above are correct Explanation: Triton has a thin atmosphere, active geysers of nitrogen gas, large fissures, and frozen lakes of water ice © 2017 Pearson Education, Inc Question 12 Many astronomers believe Pluto is perhaps best classified as a a) b) c) d) e) © 2017 Pearson Education, Inc cold terrestrial planet small jovian planet large Kuiper belt object wandering moon captured comet Question 12 Many astronomers believe Pluto is perhaps best classified as a a) b) c) d) e) cold terrestrial planet small jovian planet large Kuiper belt object wandering moon captured comet Explanation: Several other large Kuiper belt objects have been discovered, including the largest known, called Eris © 2017 Pearson Education, Inc Question 13 Which of these moons are most exciting to exobiologists? a) b) c) d) e) © 2017 Pearson Education, Inc Io and Enceladus Titan and Europa Titan and Triton Europa and Miranda Phobos and Deimos Question 13 Which of these moons are most exciting to exobiologists? a) b) c) d) e) Io and Enceladus Titan and Europa Titan and Triton Europa and Miranda Phobos and Deimos Explanation: Europa has indications of liquid water beneath the ice Titan shows evidence of channels under its dense atmosphere © 2017 Pearson Education, Inc Question 14 Which of the following is true of Pluto? a) b) c) d) e) © 2017 Pearson Education, Inc There are many fewer craters than on Earth’s Moon Tall, icy mountains are found here Large, smooth plains are found on Pluto Its moon is Charon All of these are true Question 14 Which of the following is true of Pluto? a) b) c) d) e) There are many fewer craters than on Earth’s Moon Tall, icy mountains are found here Large, smooth plains are found on Pluto Its moon is Charon All of these are true Explanation: New Horizons spacecraft traveled past the Pluto–Charon system in 2015 Images showed tall, icy mountains as well as the large plain shown here © 2017 Pearson Education, Inc ... Europa Io Amalthea Ganymede Callisto Question The surface of which jovian moon most resembles the pack ice of the Arctic Ocean? a) b) c) d) e) Europa Io Amalthea Ganymede Callisto Explanation:... of Callisto d) e) large cliffs similar to Miranda All of the above are correct Explanation: Triton has a thin atmosphere, active geysers of nitrogen gas, large fissures, and frozen lakes of water... to Miranda All of the above are correct Question 11 Neptune’s moon Triton shows a) b) c) a thick atmosphere similar to Titan volcanic features similar to those on Io cratering similar to that