ASTR 121 LECTURES 17-25

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Based on its shape, which moon formed from a molten object? a) Demios b) Luna c) Metis d) Hyperion e) Epimetheus: b) Luna
On which of the following moons would your weight be the greatest? a) Io b) Europa c) Luna d) Triton e) Callisto: a) Io
Which one of these moons is proably a captured asteroid a) Enceladus b) Hyperion c) Iapetus d) Triton e) Titan: b) Hyperion
Two moons, A and B, have the same size, but A has a density of 2.0 gm/cc and B has a density of 4.0 gm/cc. What is the ratio of their masses? a) 0.2 b) 0.75 c) 1 d) 1.5 e) 2: e) 2
Would Rhea float in water? a) No b) Yes: a) No
Which of the following is not true of shepherd moons a) their orbital periods are similar b) their orbital radii are similar c) they exchange angular momentum d) they must orbit retrograde e) they confine ring particles: d) they must orbit retrograde
What is a meteoroid? a) A body that has entered the Earth\'s atmosphere b) A body that has reached the Earth\'s surface c) A small body in interplanetary space d) A piece of dust in Earth orbit: c) A small body in interplanetary space
Why are carbonaceous chondrites especially important for the study of the early solar system a) They appear to be unaltered samples of material from the early solar system b) They are low in density c) They are rich in rare metals d) They: a) They appear to be unaltered samples of material from the early solar system
Ceres, the first asteroid to be discovered, lies between Mars and Jupiter. Why was Ceres unknown to ancient astronomers? a) It was hidden behind the Sun b) Its orbit was below the Earth\'s c) It formed late compared to the planets d) It is: e) It is too faint to be seen with the unaided eye
What evidence is there that the Sun is surrounded by a vast cloud of comets known as the Oort cloud? a) we see them with our telescopes b) we measure their perturbations on Neptune c) we have sent space probes to look at them d) new comets: d) new comets have aphelia between 10,000 and 100,000 AU
Most asteroids are located in the asteroid belt that lies between 2.1 and 3.3 AU from the Sun. What orbital periods correspond to the inside and outside of the asteroid belt? a) 1 and 100 years b) 3 and 6 years c) 25 and 30 years d) 0.1 an: b) 3 and 6 years
Why does the plasma tail of a comet point away from the Sun? a) it follows the orbit of the comet b) the solar wind pushes the ionized gas c) angular momentum d) things are lower in density in outer SS e) its too hot near Sun <: b) the solar wind pushes the ionized gas
What causes Oort cloud comets to enter the inner solar system? a) solar wind b) their orbits are altered by the gravity of passing star c) solar tides d) radioactive decay e) collisions with other comets: b) their orbits are altered by the gravity of passing star
Kirkwood gaps are caused by a) resonance with the Sun b) collisions c) radioactive decay d) the gravity of Jupiter e) interaction with Mars: d) the gravity of Jupiter
Most meteors are stopped by the atmosphere at heights of a) 10 to 100 km b) 500 to 1000 km c) 1000 to 10,000 km d) 1 to 10 meters e) 1 to 10 cm: a) 10 to 100 km
True or false, asteroids never have moons. a) true b) false c) we don\'t know: b) false
Jupiter is high in mass because a) its has more gravity b) there are many impacts from icy comets c) its near the asteroid belt d) the colder temperatures allowed the accretion of more icy materials e) the strong magnetic field attracte: d) the colder temperatures allowed the accretion of more icy materials
Suppose there were a narrow belt near Jupiter\'s equator that had a rotation period of 9h 42m. In which direction would the zonal winds blow in that belt relative to the rest of the equatorial region (which rotates at 9h 48m)? a) eastward b) wes: b) westward
Why are oxygen compounds, such as carbon dioxide, extremely low in abundance in the atmospheres of Jupiter a) there is little oxygen in the outer SS b) the great abundance of hydrogen means that hydrogen compounds rather than oxygen compounds do: b) the great abundance of hydrogen means that hydrogen compounds rather than oxygen compounds dominate
Jupiter is too warm based on the amount of solar energy it absorbs by about a) 5 degrees b) 10 degrees c) 20 degrees d) 30 degrees e) 50 degrees: c) 20 degrees
Synchrotron radiation is a) geothermal energy b) emitted electrons and ions c) due to slow moving particles d) due to strong magnetic fields e) all of the above: d) due to strong magnetic fields
What is the relationship among color, temperature, and height for the atmospheric features of Jupiter? a) dark features are lower and hotter than light features b) dark features are higher and hotter than light features c) dark features are l: a) dark features are lower and hotter than light features
What form does hydrogen take in Jupiter at the center of the planet? a) gasous b) solid c) metallic d) molecular e) water: c) metallic
The region around Jupiter is radioactive because a) large amounts of heavy metals b) leftover from formation time c) of its strong magnetic field d) interaction with its moons e) particles ejected from Io: c) of its strong magnetic field
Voyager was powered by a) solar cells b) nuclear reactor c) thermal nuclear source d) batteries e) matter/anti-matter: c) thermal nuclear source
What did Voyager tell us about Saturn\'s rings that wasn\'t already known from telescopic observations from the Earth? a) their velocities b) their color c) their chemical composition d) their ringlet structure e) their distance from Sa: d) their ringlet structure
What percentage of all planetary material in the solar system is contained in Jupiter and Saturn together? (you can calculate this by adding up all the masses of the planets) a) 10% b) 20% c) 50% d) 80% e) 90%: e) 90%
What is the ratio of Saturns volume to the Earth\'s? a) 97 b) 251 c) 850 d) 2,030 e) 10,330: c) 850
What evidence do we have that Saturn\'s rings aren\'t solid disks? a) telescope images clearly show individual rocks b) the inner parts of the rings rotate faster than the outer parts c) its impossible for them to be a solid d) there are n: b) the inner parts of the rings rotate faster than the outer parts
What happens to an asteroid that passes within the Roche distance of a planet? a) nothing, unless the planet is a jovian world b) it would be torn to pieces by tidal forces c) it will fall onto the planet surface d) it will be placed in a: b) it would be torn to pieces by tidal forces
Saturn\'s excess heat is due to a) formation energy b) potential energy c) magnetic fields d) helium rain e) asteroid impacts: d) helium rain
Saturn is more oblate than Jupiter, which means a) it has a larger mantle and smaller core b) it has a smaller mantle and smaller core c) it has a smaller mantle and larger core d) it has a larger mantle and larger core e) none of the a: a) it has a larger mantle and smaller core
Shepherd moons a) confine the ring particles b) interchange orbits c) work to deflect particles out of the rings d) serve to generate magnetic fields e) only exist around Jupiter: a) confine the ring particles
Spokes on Saturns rings are a) shepherd moons b) the Roche limit c) magnetic forces d) shadows of smaller particles e) aliens: d) shadows of smaller particles
Why was it necessary for Herschel to observe Uranus on more than a single night for him to be convinced that he had discovered a new object within our solar system? a) he was testing to see if it was a defect in the telescope mirror b) he needed: d) he had to see whether the new object moved with respect to the stars
Who are John Couch Adams and Urbain Leverrier? a) they were the astronomers who found Neptune in two separate telescopes b) they were the inventors of calculus c) they calculated that there was an unknown planet near the position where other: c) they calculated that there was an unknown planet near the position where other astronomers later found Neptune
Neptune is 50% farther from the Sun than Uranus is, yet their atmospheric temperatures are nearly the same. Why? a) the atmosphere of Uranus is warmed only by sunlight while that of Neptune is also warmed by internal energy flowing outward through: a) the atmosphere of Uranus is warmed only by sunlight while that of Neptune is also warmed by internal energy flowing outward through it.
Puck is a) a moon of Pluto b) a moon of Neptune c) a moon of Uranus d) a moon of Saturn e) an asteroid: c) a moon of Uranus
The atmosphere of Uranus is composed of a) 82% hydrogen, 19% helium, 1% methane b) 83% hydrogen, 15% carbon, 2% methane c) 83% water, 15% helium, 2% methane d) 83% hydrogen, 15% helium, 2% acetylene e) 83% hydrogen, 15% helium, 2% metha: e) 83% hydrogen, 15% helium, 2% methane
If Neptune were hollow, it could contain a) 10 Earths b) 20 Earths c) 30 Earths d) 60 Earths e) 1000 Mars: d) 60 Earths
The magnetic fields of Uranus and Neptune are a) similar to Jupiter\'s b) local events in the icy mantles c) weaker than the Earths d) due to metallic hydrogen: b) local events in the icy mantles
How does the appearance of the rings of Uranus compare with the appearance of the rings of Saturn? a) Uranus are broad, whereas Saturn are thin b) Uranus are thin, whereas Saturn are broad c) Uranus are more massive d) Saturns are older: b) Uranus are thin, whereas Saturn are broad
Which of the following is *not* found on Pluto a) nitrogen-methane atmosphere b) methane snow c) rocky core d) liquid mantle e) hydrocarbons: d) liquid mantle

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