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Radio astronomy

From Wikipedia, the free encyclopedia.

Radio astronomy is the study of celestial phenomena through measurement of the characteristics of radio waves emitted by physical processes occurring in space. Radio waves are much longer than light waves. In order to receive good signals, radio astronomy requires large antennas. Radio astronomy is a relatively new field of astronomical research.

History

One of the earliest modern investigations into extraterrestrial sources of radio waves were by Karl Guthe Jansky, an engineer with Bell Telephone Laboratories, in the early 1930s. The first object actually detected was the center of the Milky Way, followed by the sun. After World War II, substantial improvements in radio astronomy technology were made by astronomers in Europe and the United States, and the field of radio astronomy began to blossom.

Developments

Radio astronomy is also partly responsible for the idea that dark matter is an important component of our universe; radio measurements of the rotation of galaxies suggest that there is much more mass in galaxies than has been directly observed (see Vera Rubin. And the cosmic microwave background radiation was first detected using radio telescopes. However, radio telescopes have also been used to investigate objects much closer to home, including observations of the Sun and solar activity, and radar mapping of the planets.

The United States government has established an institution to conduct radio astornomy research, titled NRAO, or National Radio Astronomy Observatory. This institution controls various radio telescopes around the United States included the world's largest fully mobile radio telescope, the GBT. The United States government has also set aside a national radio quiet zone for radio astronomy research centered around Green Bank, West Virginia. As a result, Green Bank is now the home of NRAO's primary facility.

See also: Very Long Baseline Interferometry

External links

• The History of the Nancay Radio Observatory - a history of French radio astronomy
• Reber Radio Telescope - National Park Services
• The History of Radio Astronomy - Haystack Observatory, MIT
• Radio Telescope Developed - a brief history from NASA Goddard Space Flight Center

How to Get on Radio Talk Shows All Across America w/o Leaving Home		This Broad's Life: The Raucous, Riveting Autobiography of the Most Outrageous Radio Talk-Show Host in America Today		You Can't Say That : Common Sense From America's Number One Gay Radio Talk Show Host		How to Get On Radio Talk Shows All Across America
Talk Show Selects 1999: A Guide to the Nation's Most Influential Television and Radio Talk Shows		Talk Show Selects 1998: A Guide to the Nation's Most Influential Television and Radio Talk Shows (1998 Edition)		Talk Show Yearbook 2000: A Guide to the Nation's Most Influential Television and Radio Talk Shows (Talk Show Selects, 2000)		Conduct a National Radio Talk Show Tour Without Leaving Your Home or Office...Without Paying a Cent for Air Time (How to Make People Buy Whatever You)