The absolute stellar magnitude of a supernova is -18 ^ m. How often do such stars appear in the Earth’s sky with a brilliance brighter than Venus (-4 ^ m), if in the entire disk of the Galaxy with a radius of 100 thousand light years such flares occur once every 20 years?
Approximately once every 500 years (in reality – less often due to interstellar absorption of light in the disk of the Galaxy).
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