Physics, 01.07.2020 20:01, mrfluff14

How far away is a RR Lyrae variable star if it has a period of 0.5 days and a brightness of 2.3 x 10^-11 W/m^2?

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How far away is a RR Lyrae variable star if it has a period of 0.5 days and a brightness of 2.3 x 10...