The apparent brightness of an object is calculated as: apparent brightness = luminosity4π×distance2 if one knew the luminosity and apparent brightness of a star that was too distant for a parallax measurement, what would be the best approach to determining its distance?

Explanation:

The formula for apparent brightness is given by the next inequation:

Where B equals apparent brightnes, L equals luminosity and D equals distance.

SO we just have to clear distance from the formula and are left with the inequation to calculate distance:

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