If we had eyes sensitive to radio waves at a frequency of 100 MHz,86 then the sky would usually contain three main objects of roughly equal brightness: Cassiopeia A, Cygnus A and the Sun. The first two of these are a supernova remnant and a radio galaxy respectively and are more or less constant in their output. However, on occasions the Sun can brighten by a factor of 10,000, and dominate the radio sky just as it does the optical sky.
KeywordsMicrowave Flare Eter
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