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8 - Mod 5 Lesson 2

TermDefinition
Asteroids a small rocky body orbiting the sun
Big Bang Theory a THEORY about the creation of the UNIVERSE
Celestial Sphere giant spinning dome that the Greeks thought surrounded the Earth
coma the outer layer of dust and gas around a comet
Comet a ball of ice and dust that orbits around the sun in a long, narrow ellipse
comet tail Produced when a comet's orbit brings it close to the sun and the dust and ice heat up. Always points away from the sun.
constellation A group of stars that form a pattern in the sky
Geocentric A model of the universe in which Earth is at the center of the revolving planets and stars.
Gravity The attractive force between objects with mass
Heliocentric A model of the solar system in which Earth and the other planets revolve around the sun
Meteorite when a meteoroid burns in the atmosphere and hits the ground
Meteoroid a chunk of rock or dust in space that comes from comets or asteroids
Meteors the streak of light in the sky produced by the burning of a meteoroid in Earth's atmosphere
Milky Way the galaxy to which Earth and other components of our Solar System belong
Nucleus the solid core of a comet
Planet a celestial body moving in an elliptical orbit around a star.
Revolution the movement of one object around another; ex. Earth around the sun, year; 365 1/4 days
Rotation The spinning motion of a planet on its axis; ex. Earth spinning on its axis, day and night (24 hours)
scientific model a representation of an object or event that can be studied to understand the real object or event
star A ball of hot gas, primarily hydrogen and helium, that undergoes nuclear fusion.
Created by: Ms. Greenup
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