Astronomy college course/Solar system/Quiz 2/Original version of this quiz

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Solar system quiz 2

  

1 In astrophysics, what is accretion?

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

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

have been rounded by their own gravity
possess an atmosphere
lack an atmosphere
are too far from the Sun to be planets
lie in the asteroid belt

3 Dwarf planets have no natural satellites,

true
false

4 Pluto is classified as

a dwarf planet and a trans-Neptunian object.
an asteroid belt object
a dwarf planet with no natural satellites
a natural satellite of Neptune
a natural satellite of Uranus

5 How many of the outer planets have rings?

4
3
2
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.

20
2
200
2000

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

true
false

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

true
false

9 The frost line is situated approximately

5 times as far from the Sun as the Earth is from the Sun
10 times as far from the Sun as the Earth is from the Sun
5 times as far from the Earth as the Earth's surface is from its center
10 times as far from the Earth as the Earth's surface is from its center