Dr. Rachel Matson of the U.S. Naval Observatory's Celestial Reference Frames Department gives a brief explanation of the technique of Speckle Interferometry to measure double star systems.
Astronomers from the U.S. Naval Observatory are part of a team of scientists who have identified the first radio detectable triple active galactic nuclei (AGN) system by analyzing data taken by the Karl G. Jansky Very Large Array (VLA) and Very Long Baseline Array (VLBA).
