Astronomy final Uranus and neptune

In the atmospheres of the jovian planets, this component decreases, systematically, with distance from the Sun. a. Ammonia b. Helium c. Methane d. Hydrogen e. Nitrogen

A

The jovian planets with the largest diameters also tend to a. have magnetic field axes most closely aligned with their axes of rotation. b. have the fewest moons. c. have the slowest rotation rates. d. move most slowly in their orbit around the Sun.

A

Uranus's rings were discovered by the occultation of starlight, as shown in Figure13.15 in the textbook ("Occultation of Starlight"). If Uranus were moving more rapidly relative to Earth, the graph in that figure would appear a. more compressed horizontally. b. the same. c. more stretched out horizontally.

A

Moons that show few craters probably a. have been shielded from impacts by their host planet. b. have warm interiors. c are captured asteroids. d. have had their smaller craters obliterated by larger impacts.

B

Triton shows similar cratering to the Lunar highlands, which suggests that it too is an old surface. a. True b. False

B

In strength, the magnetic fields of Uranus and Neptune are: a. perfect fits for the Dynamo theory. b. even stronger than that of Jupiter. c. similar, with both about 100 times stronger than our own. d. like Jupiter and Saturn, due to mantles of liquid metallic hydrogen. e. very different, with flopped over Uranus having no field, and Neptune a strong one.

C

Miranda's appearance suggests which of the following statements? a. It is a captured Kuiper belt object. b. It cracked as it froze, creating long rifts across its surface. c. It has been catastrophically disrupted and reassembled several times. d. It is composed almost entirely of ice, giving it a highly reflective surface.

C

Studying the magnetospheres of the jovians has allowed us to measure their a. ring system diameters. b. orbital period. c. rotation rates. d. orbital radius.

C

The masses of Neptune and Uranus were first determined by a. observations of their magnetic fields. b. observations of their motions around the Sun. c. observations of the motions of their satellites. d. their densities divided by their volumes. e. their compositions.

C

The time between equinoxes on Uranus is about a. 8 hours. b. 7 hours. c. 42 years. d. 84 years. e. 21 years

C

What is the most significant difference between the Great Dark Spot of Neptune and the Great Red Spot of Jupiter? a. Relative to its planet's size, the Great Dark Spot is much larger than the Great Red Spot. b. The Great Dark Spot is not a large storm system but rather a sort of hole in the atmosphere. c. The Great Dark Spot has disappeared, whereas the Great Red Spot has been seen for hundreds of years. d. The clouds travel in opposite directions.

C

What substance is responsible for the colors of Neptune and Uranus? a. Hydrogen b. Water ice c. Methane d. Ammonia e. Hydrazine

C

Adams and Leverrier predicted the position of Neptune, based on its perturbations of a. the Sun. b. Triton. c. Saturn's rings. d. Uranus. e. Jupiter.

D

As a percentage of their total volumes, how do the cores of Uranus and Neptune compare with those of Saturn and Jupiter? a. Scientists are still not sure of the exact sizes of the cores of any of the jovian planets. b. Their cores are exactly the same size as Jupiter's and Saturn's. c. Their cores are much smaller than those of Jupiter and Saturn. d.Their cores are larger than those of Jupiter and Saturn.

D

The only spacecraft to have visited Uranus and Neptune was: a. Voyager 1. b. Cassini. c. Pioneer 11. d. Voyager 2. e. Pioneer 10.

D

Uranus was discovered about the same time as a. the Great Depression in the United States. b. the American Civil War. c. Columbus reached North America. d. the U.S. Declaration of Independence.

D

. The rings of Neptune: a. were confirmed by the Voyager 2 in 1989. b. number five, with three narrow, two more diffuse. c. often appear as clumpy ring arcs, rather than complete and symmetrical. d. all lie within Neptune's Roche Limit. e. All of these are correct.

E

Although the atmospheres of Uranus and Neptune are very similar, the atmosphere of Neptune contains more a. Nitrogen. b. Hydrogen. c. Ammonia. d. Helium e. Methane.

E

The most abundant component of the atmospheres of Uranus and Neptune is a. Nitrogen. b. Ammonia. c. Helium. d. Methane. e. Hydrogen

E

The planet whose pole was facing the Sun when Voyager 2 approached in 1986 was a. Jupiter. b. Mars. c. Saturn. d. Neptune. e. Uranus.

E