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Unit 7 (Ch. 16) – Earth in the Solar System Bach 04/08/10
Ch. 16 Vocabulary – Our Solar System
(p. 509, 15 terms + 9)
Unit 7 (Ch. 16) – Earth in the Solar System Bach 04/08/10
1. Nebula
A large cloud of gas and dust in interstellar space; a region in space where stars are born.
Unit 7 (Ch. 16) – Earth in the Solar System Bach 04/08/10
2. Solar Nebula
A rotating cloud of gas and dust from which the sun and planets formed.
Unit 7 (Ch. 16) – Earth in the Solar System Bach 04/08/10
3. Astronomical Unit
The average distance between the Earth and the sun; approximately 150 million kilometers (symbol, AU).
Unit 7 (Ch. 16) – Earth in the Solar System Bach 04/08/10
4. Terrestrial Planet
One of the highly dense planets nearest to the sun; Mercury, Venus, Mars, and Earth.
Unit 7 (Ch. 16) – Earth in the Solar System Bach 04/08/10
5. Prograde Rotation
The counterclockwise spin of a planet or moon as seen from above the planet’s North Pole; rotation in the same direction as the sun’s rotation.
Unit 7 (Ch. 16) – Earth in the Solar System Bach 04/08/10
6. Retrograde Rotation
The clockwise spin of a planet or moon as seen from above the planet’s North Pole.
Unit 7 (Ch. 16) – Earth in the Solar System Bach 04/08/10
7. Gas Giant
A planet that has a deep, massive atmosphere, such as Jupiter, Saturn, Uranus, or Neptune.
Unit 7 (Ch. 16) – Earth in the Solar System Bach 04/08/10
8. Satellite
A natural or artificial body that revolves around a planet.
Unit 7 (Ch. 16) – Earth in the Solar System Bach 04/08/10
9. Phase
The change in the sunlit area of one celestial body as seen from another celestial body.
Unit 7 (Ch. 16) – Earth in the Solar System Bach 04/08/10
10. Eclipse
An event in which the shadow of one celestial body falls on another.
Unit 7 (Ch. 16) – Earth in the Solar System Bach 04/08/10
11. Comet
A small body of ice, rock, and cosmic dust that follows an elliptical orbit around the sun and that gives off gas and dust in the form of a tail as it passes close to the sun.
Unit 7 (Ch. 16) – Earth in the Solar System Bach 04/08/10
12. Asteroid
A small, rocky, object that orbits the sun; most asteroids are located in a band between the orbits of Mars and Jupiter.
Unit 7 (Ch. 16) – Earth in the Solar System Bach 04/08/10
13. Meteoroid
A relatively small, rocky body that travels through space.
Unit 7 (Ch. 16) – Earth in the Solar System Bach 04/08/10
14. Meteor
A bright streak of light that results when a meteoroid burns up in Earth’s atmosphere.
Unit 7 (Ch. 16) – Earth in the Solar System Bach 04/08/10
15. Meteorite
A meteoroid that reaches Earth’s surface without burning up completely.
Unit 7 (Ch. 16) – Earth in the Solar System Bach 04/08/10
16. Nuclear Fusion
When hydrogen combines to form helium and energy is released.
Unit 7 (Ch. 16) – Earth in the Solar System Bach 04/08/10
17. Proton
A subatomic particle that has a positive charge and that is located in the nucleus of an atom; the number of protons in the nucleus is the atomic number, which determines the identity of an element.
Unit 7 (Ch. 16) – Earth in the Solar System Bach 04/08/10
18. Inner Solar System
Contains the four planets that are located closest to the sun.
Unit 7 (Ch. 16) – Earth in the Solar System Bach 04/08/10
19. Outer Solar System
Contains the five planets that are located farthest from the sun.
Unit 7 (Ch. 16) – Earth in the Solar System Bach 04/08/10
20. Period of Rotation
The amount of time that an object takes to rotate once.
Unit 7 (Ch. 16) – Earth in the Solar System Bach 04/08/10
21. Revolution
The motion of a body orbiting another body in space.
Unit 7 (Ch. 16) – Earth in the Solar System Bach 04/08/10
22. Period of Revolution
The time that an object takes to revolve around the sun once.
Unit 7 (Ch. 16) – Earth in the Solar System Bach 04/08/10
23. Solar Eclipse
When the moon comes between Earth and the sun and the shadow of the moon falls on part of Earth.
Unit 7 (Ch. 16) – Earth in the Solar System Bach 04/08/10
24. Lunar Eclipse
When Earth comes between the sun and the moon and the shadow of Earth falls on the moon.
Unit 7 (Ch. 16) – Earth in the Solar System Bach 04/08/10
Grading Scale(1 point per term)
A = 24 - 20
B = 19 - 18
C = 17 - 16
D = 15 - 14
F = 13 or less
*2 E.C. pt.s possible