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15 Cards in this Set
- Front
- Back
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Comet |
Loose collections of ice, dust, and small rocky particles whose orbits are usuallu very long, narrow ellipses. |
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Coma |
Clouds of gas and dust form a fuzzy outer layer. |
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Nucleus |
The solid inner core of a comet. |
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Kuiper belt |
A doughnut shaped region that extends from the beyond Neptune's orbit to about 100 times earth's distance from the sun. |
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Oort cloud |
A spherical region of comets that surrounds the solar system from about 1,000 to 10,000 times the distance between Pluto and the sun. |
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Asteroids |
Too small and too numerous to be considered full-fledged planets. |
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Asteroid belt |
Lies between Mars and Jupiter |
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Meteoroid |
A chunk of rock or dust in space. |
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Meteor |
When a meteoroid enters earths atmosphere, friction with the air creates heat and produces a streak of light in the sky. |
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Meteorites |
Meteoroids that pass through the atmosphere and strike earths surface. |
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Geocentric |
A model of universe in which Earth is at center of revolving planets and stars |
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Heliocentric |
A model of solar system in which Earth and other plante revolve around sun |
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Nuclear fusion |
The process which hydrogen atoms join together in the suns core to form helium |
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Astronomical unit |
A unit of measurement equal to earths average distance from sun, ahout 150 km |
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Light year |
Distance that light travels in one year, about 9.5 million million km |
