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

Solar system quiz 2
{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

{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

{Dwarf planets have no natural satellites, } - true + false

{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

{How many of the outer planets have rings? } + 4 - 3 - 2 - 1

{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

{The revolution of Haley's comet around the Sun is nearly circular. } - true + false

{The revolution of Haley's comet around the Sun is opposite that of the 8 planets.} + true - false

{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