Asked by fun times

ly = light years

Stars P and Q have the same luminosity, but P is 30 ly from Earth and Q is 40 ly from Earth. What is the ratio of their brightness as viewed from Earth?
Answered by Scott
their brightness ratio is the ratio of the inverse of the square of their distances

bP / bQ = (dQ / dP)^2
Answered by fun times
So it would be 900:1600
= 9:16?
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