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| energy released when atom loses energy. |
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| number of waves that pass a point of time. |
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| the distance between the crest or trough. |
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| a wave in which the crest and troughs move at |
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| allows light to pass through easily. |
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| allows some light to pass throught and reflects some light back. it diffuse light. |
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| does not allow light to pass through easily reflects almost all light. |
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| light bouncing off of objects. |
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| some light bounces off some light goes through. |
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| used to focus light to a point. |
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| used to magnafy an objects. |
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| apoint in earth's orbit around the sun where daylight is either the longestor the shortest amount possible. |
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| a point in earth's orbit around the sun where nights and days are the same length. |
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| a darkening of the moon when it passes through earth's shadow. |
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| the rise and fall of water in the ocean and seas caused mainly by the gravitation pull of the moon on the earth. |
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| a system of billions of stars,gases, and dust. |
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| brilliant objects in space that may be the powerhouseof developing galaxies. |
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| cloud of gas and dust in space. |
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| a star that has swelled and glows with a red color. |
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| the explosion of a star, releasing huge amounts of light and other energy. |
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| an invible object in space whose mas and gravittion force is so great that ot even light cn ecape. |
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