Physics – Page 20 – National Radio Astronomy Observatory

How Did Erathosthenes Know when it was Noon in Alexandria When he Measured the Earth’s Circumference?

Hello Oscar, Eratosthenes actually measured the length of the shadow of a vertical pole in Alexandria when the Sun…

Yes, in fact emission from a cloud of gas which contains hydrogen atoms which are in excited states, called…

Question: It is said that light traveling from a star that is currently 10 billion light years from us…

Question: Does light wave disintegrates(i.e. its crest and troughs vanishes leaving a straight line) when it travels unhindered and…

Question: I read that radioactive decay rates for some elements show cyclic variations, possibly due to varying solar neutrino…

Question: Can you please explain in detail how the cryogenic system for telescope amplifier cooling works? I was recently…

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.
	The U.S. National Science Foundation (NSF) is an independent federal agency created by Congress in 1950 "to promote the progress of science; to advance the national health, prosperity, and welfare; to secure the national defense..."
	AUI collaborates with the scientific community and research sponsors to plan, build, and operate cutting-edge facilities. We cultivate excellence, deliver value, enhance education, and engage the public.