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8 - Mod 5 Lesson 2
Term | Definition |
---|---|
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. |