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1h
reviewed Approve suggested edit on find resonance in planet system
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reviewed Approve suggested edit on Will we ever end up in the black hole?
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reviewed Approve suggested edit on How and when did we learn about the universe?
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comment What was the age of the universe when the average density was one atmosphere?
About 100 gigakelvin, or $10^{11}$ K (en.wikipedia.org/wiki/Big_Bang_nucleosynthesis)
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comment Stellar mass of galaxies
@AfroBoy Welcome! Glad to have been able to help you, at the end.
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answered Questions about time and space (from beginner)
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answered What was the age of the universe when the average density was one atmosphere?
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revised Stellar mass of galaxies
Replaced answer according to replaced question
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revised Stellar mass of galaxies
The answer is obsolete.
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comment Stellar mass of galaxies
@AfroBoy Thanks for the details! I'll try to solve it. The formula first given is applicable to main sequence stars, not necessarily to galaxies.
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revised Stellar mass of galaxies
added more general version, applicable to other mass ranges
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revised Stellar mass of galaxies
Added hint to restricted applicabiltity and necessary adjustments
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revised Stellar mass of galaxies
Added simplification by using "Sun" units.
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revised Stellar mass of galaxies
Added simplification by using "Sun" units.
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comment Stellar mass of galaxies
@AfroBoy On the right side of the equation you have the (probably known) $M_i/L_i$ mass-luminosity ratios. Might it be you confused $M_i$ with $M_*$ in this case?
Apr
17
revised Stellar mass of galaxies
improved formatting
Apr
17
revised Stellar mass of galaxies
improved formatting
Apr
17
revised Stellar mass of galaxies
Added stellar mass in terms of solar masses
Apr
17
revised Stellar mass of galaxies
Fixed calculation
Apr
17
answered Stellar mass of galaxies