# Astronomy college course/Solar system/Quiz 2

## AstroWikipSolSys2_Study

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### AstroWikipSolSys2_Study-v1s1

1. In astrophysics, what is accretion?

___ a) the increase in temperature and pressure of a star as it collapses from its own gravity
___ b) the growth in size of a massive star as its outer atmosphere expands
___ c) the growth of a massive object by gravitationally attracting more matter
___ d) the growth of a comet's tail as it comes close to the Sun
___ e) the condensation of volatiles as a gas cools

2. Dwarf planets are defined as objects orbiting the Sun and smaller than planets, that?

___ a) have been rounded by their own gravity
___ b) are too far from the Sun to be planets
___ c) lie in the asteroid belt
___ d) lack an atmosphere
___ e) possess an atmosphere

3. Dwarf planets have no natural satellites,

___ a) true
___ b) false

4. Pluto is classified as

___ a) a dwarf planet with no natural satellites
___ b) an asteroid belt object
___ c) a natural satellite of Neptune
___ d) a dwarf planet and a trans-Neptunian object.
___ e) a natural satellite of Uranus

5. How many of the outer planets have rings?

___ a) 4
___ b) 3
___ c) 2
___ d) 1

6. Currently there are 7 billion people on Earth, if that ever increases to 10 billion people, for every person on Earth there will be ____ stars in the Milky Way galaxy.

___ a) 20
___ b) 200
___ c) 2
___ d) 2000

7. The revolution of Haley's comet around the Sun is nearly circular.

___ a) true
___ b) false

8. The revolution of Haley's comet around the Sun is opposite that of the 8 planets.

___ a) true
___ b) false

9. The frost line is situated approximately

___ a) 5 times as far from the Sun as the Earth is from the Sun
___ b) 10 times as far from the Sun as the Earth is from the Sun
___ c) 10 times as far from the Earth as the Earth's surface is from its center
___ d) 5 times as far from the Earth as the Earth's surface is from its center

#### Key to AstroWikipSolSys2_Study-v1s1

1. In astrophysics, what is accretion?

- a) the increase in temperature and pressure of a star as it collapses from its own gravity
- b) the growth in size of a massive star as its outer atmosphere expands
+ c) the growth of a massive object by gravitationally attracting more matter
- d) the growth of a comet's tail as it comes close to the Sun
- e) the condensation of volatiles as a gas cools

2. Dwarf planets are defined as objects orbiting the Sun and smaller than planets, that?

+ a) have been rounded by their own gravity
- b) are too far from the Sun to be planets
- c) lie in the asteroid belt
- d) lack an atmosphere
- e) possess an atmosphere

3. Dwarf planets have no natural satellites,

- a) true
+ b) false

4. Pluto is classified as

- a) a dwarf planet with no natural satellites
- b) an asteroid belt object
- c) a natural satellite of Neptune
+ d) a dwarf planet and a trans-Neptunian object.
- e) a natural satellite of Uranus

5. How many of the outer planets have rings?

+ a) 4
- b) 3
- c) 2
- d) 1

6. Currently there are 7 billion people on Earth, if that ever increases to 10 billion people, for every person on Earth there will be ____ stars in the Milky Way galaxy.

+ a) 20
- b) 200
- c) 2
- d) 2000

7. The revolution of Haley's comet around the Sun is nearly circular.

- a) true
+ b) false

8. The revolution of Haley's comet around the Sun is opposite that of the 8 planets.

+ a) true
- b) false

9. The frost line is situated approximately

+ a) 5 times as far from the Sun as the Earth is from the Sun
- b) 10 times as far from the Sun as the Earth is from the Sun
- c) 10 times as far from the Earth as the Earth's surface is from its center
- d) 5 times as far from the Earth as the Earth's surface is from its center