GMVA world map (IMAGE) Green Bank Observatory Caption Map of the radio telescopes used to image Messier 87 at 3.5 millimetres in the 2018 Global Millimetre VLBI Array (GMVA) campaign. Credit Credit Helge Rottmann, MPIfR. Usage Restrictions NA License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.