The National Radio Astronomy Observatory (NRAO) enables forefront research
into the Universe at radio wavelengths and operates a complementary,
state-of-the-art suite of four radio telescope facilities for use by the
scientific community, regardless of institutional or national affiliation:
the Atacama Large Millimeter/submillimeter Array (ALMA), the Very Large Array
(VLA), the Green Bank Telescope (GBT), and the Very Long Baseline Array
(VLBA). The NRAO is a facility of the National Science Foundation operated
under cooperative agreement by Associated Universities, Inc.