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8th Topic 1 Lesson 1
8th Topic 1 Lesson 1 Vocabulary
Term | Definition |
---|---|
Satellite | a body that orbits a planet |
Star | a giant ball of superheated gas, or plasma, composed of hydrogen and helium |
Planet | an object that orbits the sun, is large enough to have become rounded by its own gravity |
Meteor | a streak of light produced when a small piece of rock or ice, known as a meteoroid, burns up as it enters Earth’s atmosphere |
Comet | a cold mixture of dust and ice that develops a long trail of light as it approaches the sun |
Constellation | a pattern or group of stars that people imagine represents a figure, animal, or object |
Geocentric | an Earth-centered model |
Heliocentric | a sun-centered model |
Ellipse | an oval shape, rather than a perfect circle |
Observations | things seen with the eyes |