Quote:
Originally Posted by ngcles
Interestingly, M4's M Vt (the total luminosity of the sum of its stars) is only a little more than the M Vt of Alpha Orionis (Rigel). Yep, one supergiant 30-40 odd solar-mass star almost equals it in brilliance. Because of their age, GCs are massive but inherently "wimpy" in light output.
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How amazing! Many thanks for the question and the answers.