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nebula – n. a cloud of gas or dust in space that can be seen by reflected or radiated light
galaxies – n. any one of a very large group of stars that make up the universe
mirror – n. a piece of glass or similar material that reflects light
vacuum – n. empty space in which there is no air, gas or other matter
infrared light – n. light radiation that is not visible to the human eye and is at a longer wavelength than visible light, associated with heat
radiation – n. energy that comes from an object in the form of waves or rays
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