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

Solar system quiz 2

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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