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--- un:radio-astronomy [2024/05/20 08:06] – 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 picometer-length gamma rays to a meter-length radio waves. Radio astronomy deals with celestial electromagnetic radiation at radio wavelengths, i. e. with meter, centimeter, millimeter or sub-millimeter waves. But 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 mainly because of the innumerable high-speed electrons in its interstellar medium.