# Astronomy college course/Galilean moons of Jupiter/questions

## AstroGalileanMoons_Study

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### AstroGalileanMoons_Study-v1s1

1. How does the density of a Galilean moon depend on its distance from Jupiter?

___ a) all the moons have nearly the same density
___ b) the density of the moons is unknown
___ c) the more dense moon is closer to Jupiter (always)
___ d) the less dense moon is closer to Jupiter (always)
___ e) the most dense moon is neither the closest nor the most distant

2. How does the mass of a Galilean moon depend on its distance from the central body?

___ a) the mass of the moons is unknown
___ b) the more massive moon is closer to Jupiter (always)
___ c) the less massive moon is closer to Jupiter (always)
___ d) the most massive moon is neither the closest nor the most distant
___ e) all the moons have nearly the same mass

3. Does Jupiter's moon Io have craters?

___ a) yes, about half from impacts and the others from volcanoes
___ b) yes, from volcanoes
___ c) no, the surface is too new
___ d) yes, from impacts
___ e) no, the surface is too old

4. The mechanism that heats the cores of the Galilean moons is

___ a) radiation from the Sun and from Jupiter
___ b) radiation from the Sun
___ c) radioactive decay of heavy elements
___ d) tides from the other moons and Jupiter
___ e) tides from Jupiter

5. Immediately after publication of Newton's laws of physics (Principia), it was possible to "calculate" the mass of Jupiter. What important caveat applied to this calculation?

___ a) tides from the other moons and Jupiter.
___ b) They needed to wait over a decade for Jupiter to make approximately one revolution around the Sun.
___ c) Only the mass of Jupiter relative to that of the Sun could be determined.
___ d) The different moons yielded slightly different values for the mass of Jupiter.
___ e) The different moons yielded vastly different values for the mass of Jupiter.

6. Ganymede, Europa, and Io have ratios in __________ that are 1:2:4.

___ a) orbital period
___ b) Two other answers are correct (making this the only true answer).
___ c) rotational period
___ d) density
___ e) Argon isotope abundance

7. Which of Jupiter's moons has an anhydrous core?

___ a) Ganymede
___ b) Io
___ c) Ganymede
___ d) Two other answers are correct (making this the only true answer).
___ e) Europa

#### Key to AstroGalileanMoons_Study-v1s1

1. How does the density of a Galilean moon depend on its distance from Jupiter?

- a) all the moons have nearly the same density
- b) the density of the moons is unknown
+ c) the more dense moon is closer to Jupiter (always)
- d) the less dense moon is closer to Jupiter (always)
- e) the most dense moon is neither the closest nor the most distant

2. How does the mass of a Galilean moon depend on its distance from the central body?

- a) the mass of the moons is unknown
- b) the more massive moon is closer to Jupiter (always)
- c) the less massive moon is closer to Jupiter (always)
+ d) the most massive moon is neither the closest nor the most distant
- e) all the moons have nearly the same mass

3. Does Jupiter's moon Io have craters?

- a) yes, about half from impacts and the others from volcanoes
+ b) yes, from volcanoes
- c) no, the surface is too new
- d) yes, from impacts
- e) no, the surface is too old

4. The mechanism that heats the cores of the Galilean moons is

- a) radiation from the Sun and from Jupiter
- b) radiation from the Sun
- c) radioactive decay of heavy elements
+ d) tides from the other moons and Jupiter
- e) tides from Jupiter

5. Immediately after publication of Newton's laws of physics (Principia), it was possible to "calculate" the mass of Jupiter. What important caveat applied to this calculation?

- a) tides from the other moons and Jupiter.
- b) They needed to wait over a decade for Jupiter to make approximately one revolution around the Sun.
+ c) Only the mass of Jupiter relative to that of the Sun could be determined.
- d) The different moons yielded slightly different values for the mass of Jupiter.
- e) The different moons yielded vastly different values for the mass of Jupiter.

6. Ganymede, Europa, and Io have ratios in __________ that are 1:2:4.

- a) orbital period
+ b) Two other answers are correct (making this the only true answer).
- c) rotational period
- d) density
- e) Argon isotope abundance

7. Which of Jupiter's moons has an anhydrous core?

- a) Ganymede
+ b) Io
- c) Ganymede
- d) Two other answers are correct (making this the only true answer).
- e) Europa