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braswell, Cousins,
Term | Definition |
---|---|
terrestrial | in, of or about earth, LAND |
gaseous | being gas like |
gas giants | a large planet of relatively low density consisting predominantly of hydrogen and helium, such as Jupiter, Saturn, Uranus, or Neptune. |
orbit | a planets path around the star |
gravity | the force that attracts a body toward the center of the earth, or toward any other physical body having mass. |
inertia | the tendency to do nothing and remain unchanged. |
phases | each of the aspects of the moon or a planet, according to the amount of its illumination, especially the new moon, the first quarter, the full moon, and the last quarter. |
eclipses | an obscuring of the light from one celestial body by the passage of another between it and the observer or between it and its source of illumination. |
solar eclipse | an eclipse in which the sun is obscured by the moon. |
lunar eclipse | an eclipse in which the moon appears darkened as it passes into the earth's shadow. |
umbra | the dark central part of a sunspot. |
penumbra | the shadow cast by the earth or moon over an area experiencing a partial eclipse. |
comets | a celestial object consisting of a nucleus of ice and dust and, when near the sun, a “tail” of gas and dust particles pointing away from the sun. |
coma | cosmic snowballs of frozen gases, rock and dust that orbit the Sun. When frozen, they are the size of a small town. |
asteriods | any of millions of small celestial objects revolving around the sun, often irregularly shaped and having a great range in size, mostly in the asteroid belt |
meteoroids | any of the small bodies, often remnants of comets, traveling through space: when such a body enters the earth's atmosphere it is heated to luminosity and becomes a meteor. |
Kuiper Belt | a disk-shaped region on the edge of the solar system that contains masses of ice and icy rock, believed to be the source of comets with orbital periods of less than 200 years. |
asteroid belt | region between Mars and Jupiter |
meteor | a meteorioid that has entered the Earth's atmosphere |
meterorite | a meteor that has landed on earth |