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DIFFRACTION
The spreading of light waves as they pass through an opening or around obstacles.

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REFRACTION
The bending of light as it passes through different mediums.

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REFLECTION
The bouncing of light off a surface.

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LIGHT
Electromagnetic radiation that can be detected by the human eye.

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Light and Telescopes

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RADIO ASTRONOMY
The study of celestial objects using radio waves.

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X-RAY ASTRONOMY
The study of celestial phenomena that emit X-rays, such as black holes and neutron stars.

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INFRARED ASTRONOMY
The study of celestial objects using infrared radiation.

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BLUESHIFT
The shortening of a light wave due to an object moving toward the observer.

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REDSHIFT
The lengthening of a light wave due to an object moving away from the observer, indicating cosmic expansion.