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very long baseline interferometry

noun Radio Astronomy.
  1. an interferometry technique that enhances angular resolution in the observation of radio signals from distant celestial objects, as quasars, by combining signals from several radio telescopes around the earth or such signals with those from an earth-orbiting satellite. Abbreviation: VLBI
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018