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Mizar A movie

An optical interferometer records the dance steps of the two stars of Mizar A.
Mizar, 88 light-years distant, is the middle star in the handle of the Big Dipper. It was the first binary star system to be imaged with a telescope. Spectroscopic observations show periodic Doppler shifts in the spectra of Mizar A and B, indicating that they are each binary stars. But they were too close to be directly imaged — until May 2, 1996, when the Navy Prototype Optical Interferometer (NPOI) produced the first image of Mizar A. That image had the highest angular resolution ever ac...

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