Associated Universities (AUI) and the National Radio Astronomy Observatory (NRAO) have made a preliminary examination of the report from the National Science Foundation (NSF) Astronomy Portfolio Review Committee (PRC).

Among the recommendations of that report are that the NSF's Green Bank Telescope (GBT) and Very Long Baseline Array (VLBA) be fully divested from the NSF Astronomy Division's portfolio of research facilities in the next five years, with no further funding from the Astronomy Division.

AUI and NRAO recognize and acknowledge the need to retire obsolete facilities to make way for the state-of-the-art. However, both the GBT and the VLBA are the state-of-the-art, and have crucial capabilities that cannot be provided by other facilities.

Separately the two telescopes provide unparalleled scientific access to the universe. When their information is combined, the instruments provide the highest sensitivity and resolution available for any astronomical instrument in the world.

The Green Bank Telescope The GBT, located in Green Bank, West Virginia, is the largest and most capable fully steerable single-dish radio telescope in the world. It is a cutting-edge research instrument at the height of its powers, and it is continually growing more capable through the introduction of low-cost upgrades to its light detecting and processing electronics. It is the only world-class astronomical telescope in the eastern United States and has been in full scientific operation for less than 10 years.

Weighing sixteen million pounds, and able to precisely point its 2.3 acres of light-collecting surface area anywhere within all but the southernmost 15 percent of the celestial sphere, the $95 million GBT is an engineering and scientific marvel unlikely to be recreated, much less surpassed, by American astronomy for decades to come.

Indeed, astronomers in other parts of the world are at work trying to build their own telescopes of similar concept and design to the GBT, but none of those telescopes will exceed its performance.

The GBT is used by astronomers and students around the world for important research. It is a powerful tool for searching out the molecular building blocks of life in space, for probing the nature of matter at extreme densities, for mapping diffuse clouds of intergalactic gas that are invisible to other telescopes, for finding beacons in space that can serve as mileposts for calibrating our understanding of cosmic distance scales and the characteristics of dark energy, for detecting gravity waves first predicted by Einstein, and for pioneering and experimenting with new observational tools and techniques.

The GBT's annual cost of operation is about 0.7 percent of the annual federal budget for astronomy and astrophysics, but the cost of replacing it, once it's gone, would be enormous. In an era of constrained budgets, leveraging and improving the existing state-of-the-art through low-cost technology upgrades (the development of which often involves students) is a cost-effective way to keep science moving forward.

Today's GBT, because of such improvements, is 10 to 100 times more powerful than the original telescope, which entered full science operations in 2003. With small upgrades, the GBT has substantial potential to continue on this upward arc of increasing scientific power.

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AUI and NRAO Comment On NSF's Astronomy Portfolio Review Committee