The Tracking and Data Relay Satellite System (TDRSS), operated for NASA by Spacecom, was used in conjunction with 64-meter radio telescopes in Australia and Japan to perform very long baseline interferometry in space. Using this technique it has been possible to obtain angular resolution equivalent to that of a radio telescope with a diameter 1.4 times the size of the earth. See page 187. [Photograph courtesy of TRW, Inc.]

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