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Exploring the Heavens Terms

Exploring the Heavens Terms - Exploring the Heavens-Terms 1...

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Exploring the Heavens-Terms 1. Planet - one of nine major bodies that orbit the sun 2. Star - a glowing ball of gas that is held together by its own gravity and powered by nuclear fusion in its core 3. Galaxy - gravitationally bound collection of a large number of stars. The sun is a star in the Milky Way galaxy 4. universe - the totality of all space, time, matter, and energy 5. astronomy - the study of the universe 6. Constellations - a human grouping of stars in the night sky into a recognizable pattern 7. celestial sphere - Imaginary sphere surrounding earth to which all objects in he sky were once considered to be attached 8. rotation - spinning motion of a body about an axis 9. North celestial pole - point on the celestial sphere directly above earth’s North Pole. 10. South celestial pole - point on the celestial sphere directly above earth’s South Pole. 11. celestial equator - The projection of earths equator onto the celestial sphere 12. Celestial coordinates - pair of quantities-right ascension and declination-similar to longitude and latitude on earth, used to pinpoint locations of objects on the celestial sphere. 13. Declination - celestial coordinate used to measure latitude above or below the celestial equator on the celestial sphere. 14. Right ascension - celestial coordinates used to measure longitude on the celestial sphere. The zero point is the position of the sun a the vernal equinox.
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