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Earth & Space Sci.
| Term | Definition |
|---|---|
| axis | an imaginary line about which an object rotates |
| totation | to turn around an axis (spin) |
| revolution / orbit | to move around or to circle an object; the path one object takes in moving around another object |
| season | four distinct periods of the year (summer, winter, autumn, spring); a particular period of the year marked by climatic features (rainy season, hurricane season, etc.) |
| planet | a celestial body moving in an elliptical orbit around a star |
| moon / satellite | a celestial body orbiting a planet (natural like the Moon or artificial like a man-made satellite) |
| comet | a celestial body with a nucleus of ice and dust and an irregular orbit through the solar system |
| asteroid | a smaller rocky body orbiting the sun |
| meteoroid | a smaller rocky body moving in the solar system, which could become a meteor if it enters the Earth’s atmosphere and a meteorite if it reaches the Earth’s surface |
| star | a large fixed sphere of glowing gas |
| solar system | a collection of a star and the objects which orbit it |
| light year | a measure of how far light will travel in one year (nearly 6 trillion miles) |
| constellation | a group of stars forming a recognizable pattern traditionally named after a mythological figure; modern astronomers divide the sky into 88 constellations to provide a “map” of space from our view |
| galaxy | a collection of stars, gas and dust |
| Universe | all existing space and matter |
Created by:
Mr.Moyer
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