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Radio Astronomy

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Methods to Remove the Deleterious Effects of the Earth’s Atmosphere on Astronomical Measurements

Question: Would it be possible to improve astronomical seeing on earth using a circular surrounding array of lasers pointing…

How Far Away Could We See An Alien Civilization Transmitting a Powerful Radio Signal in Our Direction?

Question: If the most powerful transmitter currently used on Earth was used by an alien civilization, what is the…

How Do You Measure the Mass of a Black Hole with Radio Waves?

Question: How can you measure the mass of a black hole with radio waves? What is the mass of…

Why Do You Need So Many Radio Telescopes?

Question: Why do you need so many radio telescopes? Do they all receive exactly the same frequency? How are…

Where Can I Find Fluxes for Strong Radio Galaxies?

Question: I am trying to calibrate New Horizons radiometry data and need flux of strong radio sources (Cas A,…

How Do You Distinguish Between People-Made Signals and Those From Space?

Question: You have loads of terrestrial interference, so how do you know the signals you receive are extra terrestrial?…

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The National Radio Astronomy Observatory is a facility of the U.S. National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
Founded in 1956, the NRAO provides state-of-the-art radio telescope facilities for use by the international scientific community. NRAO telescopes are open to all astronomers regardless of institutional or national affiliation. Observing time on 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. 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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