Exam 7: Our Planetary System

A) All the planets orbit counterclockwise around the Sun.
B) The inner planets orbit the Sun counterclockwise while the outer planets orbit the Sun clockwise.
C) All the planets except Uranus orbit the Sun counterclockwise;Uranus orbits in the opposite direction.
D) The inner planets orbit the Sun clockwise while the outer planets orbit the Sun counterclockwise.

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A) Venus does not have a moon.
B) Jupiter has a very small axis tilt.
C) Saturn has no solid surface.
D) The diameter of Earth's Moon is about 1/4 that of Earth.

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A) Asteroids are rocky bodies and are denser than the comets,which are made of icy material.
B) Asteroids are rocky bodies and are less dense than the comets,which are made of icy material.
C) Asteroids are made of icy material and are denser than the comets,which are more rocky.
D) Asteroids are made of icy material and are less dense than the comets,which are rockier.
E) Asteroids and comets are both made of rocky and icy material,but asteroids are smaller in size than comets.

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A) rocky minerals and water,as on Earth
B) hydrogen and helium
C) ammonia and methane
D) ammonia and water
E) nitrogen and methane

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A) Its surface temperature is very cold.
B) It is made mostly of ices.
C) Its orbit is not very close to being circular.
D) It has few moons.
E) It doesn't have rings.

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A) The flyby can use less expensive cameras than the orbiter.
B) The flyby is easier to design than the orbiter.
C) The fuel needed for an orbiter to slow down when it reaches Pluto is very expensive in and of itself.
D) The fuel needed for an orbiter to slow down when it reaches Pluto adds a lot of weight to the spacecraft.
E) The question is incorrect;in general,orbiters are cheaper than flybys.

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A) It saved money because the spacecraft used atmospheric drag to slow down rather than needing to carry enough fuel to slow by firing rocket engines.
B) It allowed the orbiters to get higher resolution pictures of the surface as it came close when skimming through the atmosphere.
C) It allowed the spacecraft to collect samples of the atmospheric gas for return to Earth.
D) Each spacecraft also carried a lander,and the lander could only be dropped to the Martian surface when the spacecraft passed through the atmosphere.

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A) the technique of using a planetary atmosphere to change the orbit of a spacecraft
B) the use of a planetary atmosphere to redirect a spacecraft to another planet
C) the controlled landing of a spacecraft on a planetary surface
D) the gradual decrease of speed as a spacecraft leaves the solar system
E) the destruction of a spacecraft by the intense pressure as it descends into the atmosphere

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Comparative planetology is the approach ...

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A) Jupiter
B) Neptune
C) Uranus
D) Mars
E) All the jovian planets have rings.

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A) It explains the fact that the Sun generates energy to shine by losing some 4 million tons of mass each day.
B) It explains why the Sun's surface temperature is about 6,000°C.
C) It explains why the Sun is so massive.
D) It explains why the Sun has a magnetic field strong enough influence the atmospheres of the planets.

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A) Terrestrial planets contain large quantities of ice and jovian planets do not.
B) Terrestrial planets orbit much closer to the Sun than jovian planets.
C) Terrestrial planets are higher in average density than jovian planets.
D) Jovian planets have rings and terrestrial planets do not.

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A) Mercury,Venus,Earth,and Mars.
B) Jupiter,Saturn,Uranus,and Neptune.
C) Mercury,Venus,Earth,Mars,and Pluto.
D) Jupiter,Saturn,Uranus,Neptune,Pluto,and Eris.

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A) between the orbits of Mars and Jupiter
B) in the Kuiper belt
C) in the Oort cloud
D) between the orbits of the jovian planets
E) between the orbits of the terrestrial planets

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A) Mercury
B) Venus
C) the Moon
D) Mars
E) Jupiter

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A) The Sun is a star.
B) The Sun's diameter is about 5 times that of Earth.
C) The Sun contains more than 99% of all the mass in our solar system.
D) The Sun is made mostly of hydrogen and helium.

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