Which of the following must be true if we are to infer, Ask an Expert

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Q. Which of the following must be true if we are to infer (calculate) a star's luminosity directly from the inverse square law for light?

We have measured the star's apparent brightness.
We have measured the star's distance.
The star must be a member of a binary system.
No interstellar gas or dust absorbs or scatters light between us and the star.
We have measured the star's spectral type.

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