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Crossword clues

Solve these clues to fill the grid.

German physicist who was the first to produce electromagnetic waves artificially
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A very light colorless element that is one of the six inert gasses
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What lets us see; the opposite of dark
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The path described by one celestial body in its revolution about another (plural)
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Energy that travels in waves or particles
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Kitchen appliance that cooks food by passing an electromagnetic wave through it (plural)
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Of or having a geosynchronous orbit such that the position in such an orbit is fixed with respect
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An arrangement of parts or elements (plural)
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The maximum displacement of a periodic wave
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Any of the nine large celestial bodies in the solar system that revolve around the sun and shine (plural)
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The change in direction of a propagating wave when passing from one medium to another (plural)
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The activity of ___
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Electromagnetic radiation emitted during radioactive decay and having an extremely short wavelength (plural)
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Displaying numbers rather than scale positions
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Twinkling lights in the night sky
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Any celestial body orbiting around a planet or star (plural)
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