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Chapter 3 Science
Lesson 2 Introducing the Solar System
Term | Definition |
---|---|
solar system | the system consisting of the sun and the planets and other objects that revolve around it. |
astronomical unit | a unit of distance equal to the average distance between Earth and the sun, about 150 million kilometers. |
planet | an object that orbits a star, is large enough to have become rounded by its own gravity and has cleared the area or its orbit |
dwarf planet | an object that orbits the sun and is spherical but has not cleared the area of its orbit |
planetesimal | one of the small asteroid-like bodies that formed the building blocks of the planets |