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Correlation Movie: text

Using a principle called interferometry, the signals from separate radio telescopes can be mathematically combined to improve their resolving power.

It works like this.

Radio waves from the same object reach the separate dishes at slightly different times. Once detected, this difference is correlated by computers, and a composite signal is created, as if it came from a much larger telescope whose diameter spans the dishes.

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Copyright, (c) 1995: Board of Trustees, University of Illinois

NCSA. Last modified 11/12/95