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Comparison of the (left) VLSS and (right) VLSSr for two extended objects. (Top) Abell 194 is two luminous and distorted radio galaxies at the center of a low-redshift galaxy cluster. The improvement is due to a combination of increased extended source sensitivity and lower noise. (Bottom) W41 is a giant shell-type supernova remnant in the Milky Way. The improvement is due to the improved RFI suppression and the increased extended source sensitivity.

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The rotating circumstellar disk around the Herbig Ae star HD163296, observed in the J=3-2 line of CO by ALMA. The contours outline the first moment intensity map of the emission.

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The NSF National Radio Astronomy Observatory and NSF Green Bank Observatory are facilities of the U.S. National Science Foundation operated under cooperative agreement by Associated Universities, Inc.

Founded in 1956, the NSF NRAO provides state-of-the-art radio telescope facilities for use by the international scientific community. NSF NRAO telescopes are open to all astronomers regardless of institutional or national affiliation. Observing time on NSF NRAO telescopes is available on a competitive basis to qualified scientists after evaluation of research proposals on the basis of scientific merit, the capability of the instruments to do the work, and the availability of the telescope during the requested time. NSF NRAO also provides both formal and informal programs in education and public outreach for teachers, students, the general public, and the media.

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