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24 Cards in this Set
- Front
- Back
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Gravity
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a force of attraction (a pull) between two objects
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Orbit
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path an object takes around another
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inertia
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tendency of a moving object to keep moving in a straight line
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revolution
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one complete trip around the sun
-Earth's revolution is 365 1/4 days |
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rotation
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one complete spin on the axis
- Earth's rotation is 24 hours |
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phase
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the moon's appearance & shape as seen at a particular time
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solar eclipse
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the moon passes between the sun & Earth
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lunar eclipse
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the moon moves into Earth's shadow, no longer reached by direct sunlight
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tide
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rise & fall of the ocean's surface
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telescope
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makes distant objects seem larger & nearer
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planet
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large, nearly spherical object that orbits a star
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moon
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natural object that orbits a planet
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satellite
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object in space that circles around another object (moons)
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comet
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mixture of frozen gases, ice, dust, & rock that moves in an elliptical orbit around the sun
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asteroid
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rock that revolves around the sun
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meteor
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a chunk of rock from space that travels through Earth's atmosphere
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star
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object that produces it's own energy (light & heat)
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nebula
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huge cloud of gases & dust
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white dwarf
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small, very dense star that shines a cooler white light
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supernova
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exploding star
- shine brightly for days, weeks, then fade away |
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black hole
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object that is so dense & has such powerful gravity nothing escapes it, even light
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constellation
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patterns formed by groups of stars in the night sky.
-people thought they looked like animals or people |
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light year
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distance that light travels in a year
-appx. 9.5 billion kilometers |
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galaxy
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huge, distant collection of stars
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