Physics
Physics, 05.07.2019 02:20, tydendf10

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...

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