Luminosity Law
In 1922, Hubble published the result of his investigations on bright nebulae. One part of this work is the Hubble luminosity law for reflection nebulae which make a relationship between the angular size (R) of the nebula and the apparent magnitude (m) of the associated star:
- 5 log(R) = -m + k
where k is a constant that depends on the sensitivity of the measurement.
Read more about this topic: Reflection Nebula
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