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A Radio Telescope in Green Bank, West Virginia

Description
Detecting invisible radiation
Photographic films are used to detect ultraviolet and infrared wavelengths
Most invisible wavelengths do not penetrate Earth’s atmosphere, so balloons, rockets, and satellites are used
Radio radiation
Reaches Earth’s surface

Radio telescopes
Large because radio waves are about 100,000 times longer than visible radiation
Often made of a wire mesh
Have rather poor resolution
Can be wired together into a network called a radio interferometer
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