Chapter 4, lesson 1: Introducing the solar system – Flashcards
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What does the solar systems consists of?
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Our solar systems consists of the sun, the planets, their moons, And a variety of smaller objects.
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What holds the solar system together?
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The force of gravity holds the solar system together.
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What is the astronomical unit?
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A way to measure the distances within the solar system.
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What are the first four planets made of?
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The first four planets are small and are mostly made of rock and metal.
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What are the last four planets made of?
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The last four planets are very large and are mostly made of gas and liquid.
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What is a dwarf planet?
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A dwarf planet is an object that orbits the sun and has enough gravity to be spherical, but has not cleared the area of its orbit.
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What are the 5 dwarf planets in our solar systems?
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Pluto, Eris, Ceres, Makemake, Haumea.
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What are comets?
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Comets are loose balls of ice and rock that usually have very long, narrow orbits.
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When did the solar system form?
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The solar system formed about 4.6 billion years ago from a could of hydrogen, helium, and rock ice pulled together by gravity.
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What is planetesimals?
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when rock and ice form small bodies.
