28-12-2012, 04:55 PM
Radio astronomy
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Introduction
Radio Astronomy is the subfield of Astronomy that studies celestial objects at radio frequencies.
It require large telescopes to observe longer wavelength.
Electromagnetic Spectrum
Electromagnetic spectrum is the complete range of electromagnetic wave on continuous distribution from very low range of frequency or very large wavelength to large range of frequency or small wavelength which occupy definite place in spectrum.
Sources of Radio Emission
These are also known as Astronomical sources.
Solar System-Sun, planets
Stars - star forming regions, old stars, supernova remnants
Galaxies
Milky way-star
Pulsars
Extragalactic -Quasars
Thermal Emission
It depend on temperature of emitting objects or objects with temperature above absolute zero emits thermal radiation.
It causes atom to move and bump one other-change the direction-emits radiations.
It is of three types..
Value of Radio Astronomy
The purpose of the National Radio Astronomy Observatory is to do fundamental research on the nature of the universe in which we live. This research seeks to answer some of the biggest questions we can ask, such as how did the universe begin (or did it begin), how big is it, how old is it, and how will it end (or will it end)? As the science that provides the framework knowledge of where we, and the planet on which we live, fit into the environment of the universe.