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ConcepTest
By looking at the spectra of two stars, we learn that they are both main sequence stars, and they have the same temperature.
If we can measure the distance to ONE of the stars using trigonometric parallax, can we find the distance to the other star? (A=yes, B=no)
If we could not measure the distance to ANY stars using trigonometric parallax, can we find the luminosity of these stars? (A=yes, B=no)
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