Astronomy Picture of the Day . A Very Large Array of Radio Telescopes . ... 27.07.1997 . ... Credit: S. Winfrey ( U. Michigan ), NRAO Explanation: Pictured above is one of the world's premiere radio astronomical observatories: The Very Large Array (VLA). ... The VLA is the most sensitive radio telescope ever, and, through interferometry , can resolve a golf ball-sized radio source 150 kilometers away (0.04 arcsec). ... Publications with keywords: radio . Publications with words: radio . ...