Solved > 11) Why are there no impact craters on:2042869 …

11) Why are there no impact craters on the surface of Io?

A) It is too small to have been bombarded by planetesimals in the early solar system.

B) Jupiter’s strong gravity attracted the planetesimals more strongly than Io and thus none landed on its surface.

C) Io did have impact craters but they have all been buried in lava flows.

D) Any craters that existed have been eroded through the strong winds on Io’s surface.

E) Io’s thick atmosphere obscures the view of the craters.

12) What is the most important reason why an icy moon is more likely to be geologically active than a rocky moon of the same size?

A) Ice has a lower melting point than rock.

B) Ice is less rigid than rock.

C) Ice contains more radioactive elements than rock.

D) Ice is affected by tidal forces to a greater extent than rock.

E) Ice is less dense than rock.

13) What mechanism is most responsible for generating the internal heat of Io that drives its volcanic activity?

A) accretion

B) radioactive decay

C) differentiation

D) tidal heating

E) bombardment

14) Which of the following is not due to tidal forces?

A) the synchronous rotation of the Moon around Earth

B) the volcanos on Io (a moon of Jupiter)

C) the rings of Saturn

D) the grooved terrain of Enceladus (a moon of Saturn)

E) the retrograde orbit of Triton (a moon of Neptune)

15) What is the most abundant gas in Titan’s atmosphere?

A) methane

B) nitrogen

C) hydrogen compounds

D) oxygen

E) argon

16) Which of the following statements about Titan is not true?

A) It may have an ocean of liquid ethane.

B) Its atmosphere is mostly nitrogen.

C) Its temperature is too cold for liquid water to exist.

D) Its surface is hidden from view by its thick atmosphere.

E) It is the coldest moon in the solar system.

17) Which moon did the Huygens spacecraft land on?

A) Ganymede

B) Callisto

C) Europa

D) Titan

E) Triton

18) What did the Huygens probe photograph as it landed on Titan?

A) dry, featureless plains

B) a water world of frozen ice sheets

C) a pockmarked surface covered with volcanos

D) hills, valleys and rivers

E) nothing; there was zero visibility due to the methane smog

19) How thick are Saturn’s rings from top to bottom?

A) a few million kilometers

B) a few tens of thousands of kilometers

C) a few hundred kilometers

D) a few kilometers

E) a few tens of meters

20) Which of the following best describes the composition of the particles forming Saturn’s rings?

A) Water ice

B) Metallic grains

C) Methane ice

D) Volcanic rock

E) Hydrogen and helium

21) Why are Saturn’s rings so thin?

A) Saturn’s gravity prevents particles from migrating upwards out of the rings.

B) The “gap” moons shepherd the particles and maintain its thin profile.

C) Any particle in the ring with an orbital tilt would collide with other ring particles, flattening its orbit.

D) Solar radiation pressure keeps particles pressed into the rings.

E) The current thinness is a short-lived phenomenon that is special to this time.

22) Planetary rings are

A) nearer to their planet than any of the planet’s large moons.

B) orbiting in the equatorial plane of their planet.

C) composed of a large number of individual particles that orbit their planet in accord with Kepler’s third law.

D) known to exist for all of the jovian planets.

E) all of the above

23) What is the Cassini division of Saturn’s rings?

A) a dark ring, visible from Earth, composed of dark, dusty particles

B) a large gap, visible from Earth, produced by an orbital resonance with the moon Mimas

C) the imaginary circle marking the halfway point of Saturn’s rings

D) the widest ring of Saturn, located between two large ring gaps

E) the most opaque ring of Saturn, made of highly reflective ice particles

24) Which of the jovian planets have rings?

A) Jupiter

B) Saturn

C) Uranus

D) Neptune

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