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--- un:radio-astronomy [2024/05/20 07:55] – asad
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-====== Radio astronomy ======
-Human eye can detect [[electromagnetic radiation]] within a narrow range from 400 nm to 700 nm, but astronomical objects emit light of all wavelengths from a few picometer long gamma rays to a few meter long radio waves. Radio astronomy deals with celestial electromagnetic radiation at radio wavelengths, i. e. with meter, centimeter, millimeter or sub-millimeter waves. However, mm and sub-mm astronomy is slowly turning into a separate branch of its own.
-If we had radio eyes and looked at the sky, the Sun would still be very bright, but different. Its non-thermal emissions would dominate over the thermal blackbody radiation, the corona would be visible as a hazy envelope. The planets would be seen not in reflected light, but in their own invisible light. The Milky Way would shine not because of its stars, but because of the innumerable high-speed electrons in its interstellar medium.