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Short answer
The National Radio Astronomy Observatory (NRAO) is a U.S. National Science Foundation facility that provides radio telescopes to astronomers worldwide. NSF funds it under a cooperative agreement with Associated Universities, Inc. (AUI), which operates it. Observing time is allocated competitively on scientific merit, not bought.
Definition and scope
NRAO describes itself as a facility of the U.S. National Science Foundation, founded in 1956 and headquartered in Charlottesville, Virginia. It is funded by the National Science Foundation (NSF) and operated by AUI, which NRAO describes as a science management corporation. Its telescopes are open to all astronomers regardless of institutional or national affiliation. NRAO’s own pages name these facilities: the Karl G. Jansky Very Large Array (VLA), the Very Long Baseline Array (VLBA), the Green Bank Telescope (GBT), the Atacama Large Millimeter/submillimeter Array (ALMA), and the next-generation VLA (ngVLA), a planned project.
For the scientific field behind these instruments, see What Is Astronomy? and What Is Astrophysics?.
How NRAO is run and funded
NRAO’s science site states that NSF NRAO and the NSF Green Bank Observatory are “facilities of the U.S. National Science Foundation operated under cooperative agreement by Associated Universities, Inc.” That sentence carries the administrative model: the government owns the mission and funds the facility, and a non-federal organization manages operations. A cooperative agreement is an assistance instrument in which the funding agency stays substantially involved, which separates it from a grant or a procurement contract.
How researchers get observing time
NRAO states that observing time on its telescopes is available on a competitive basis to qualified scientists. Proposals are judged on scientific merit, whether the instrument can do the work, and telescope availability in the requested period. NRAO’s science site organises the process under these named resources: Call For Proposals, Proposal Prep, Prop Eval and Time Alloc, and Data Archive. Check the current call on the NRAO site for dates and rules.
Who runs what
| Name | What NRAO’s pages say |
|---|---|
| NSF NRAO | Runs ALMA (with the North American ALMA Science Center), the VLA and the VLBA; operated by AUI under a cooperative agreement with NSF. |
| NSF Green Bank Observatory | Listed alongside NRAO as a separate NSF facility, also operated by AUI under cooperative agreement; the GBT is among its facilities. |
| ALMA | An international array; NRAO lists it among the telescopes it runs, and AUI’s site lists the ALMA Observatory as a separate AUI entity. |
| ngVLA | Listed by NRAO as a project, not an operating telescope. |
Where it matters for research administration
For grants and sponsored-programs staff, NRAO is an example of a federally funded national facility whose access is merit-based rather than affiliation-based. A researcher does not need to be at a particular institution to propose, and telescope time is allocated through peer evaluation, a pattern familiar from any competitive award. Broader NSF funding for the physical sciences is covered in NSF MPS, and the optical and infrared counterpart is covered in NOIRLab.
Common misunderstandings
- NRAO is not NOIRLab. NOIRLab is the NSF optical-infrared program; NRAO is the radio and millimeter facility.
- NRAO and Green Bank are listed separately. NRAO’s science site names NSF NRAO and NSF Green Bank Observatory as two facilities sharing an operator and funder.
- Telescope time is not purchased. It is awarded competitively to qualified scientists.
- Applicants need not be US-based. NRAO states access is regardless of institutional or national affiliation.
FAQ
Who funds NRAO?
The U.S. National Science Foundation, which NRAO names as its funder.
Who operates NRAO?
Associated Universities, Inc. (AUI), under a cooperative agreement with NSF.
Can researchers outside the United States use NRAO telescopes?
Yes. NRAO says its telescopes are open to all astronomers regardless of institutional or national affiliation, subject to competitive evaluation.
Where is NRAO headquartered?
Charlottesville, Virginia, according to NRAO’s about page.
Sources
- NRAO, About NRAO: public.nrao.edu/about (read 2026-11-08).
- NRAO Science Portal, About: science.nrao.edu/about (read 2026-11-08).
- Associated Universities, Inc., NRAO: aui.edu/nrao (read 2026-11-08).
