the energy transferred through space by electromagnetic waves

electromagnetic radiation that can be seen with the unaided eye

the range of wavelengths of electromagnetic waves

the distance between two corresponding parts of a wave, such as the distance between two crests

an optical instrument that forms enlarged images of distant objects

something that completes or makes up a whole

one of the different apparent shapes of the moon as seen from Earth

the movement of an object around another object

the path of an object as it revolves around another object in space

the spinning motion of a planet on its axis

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