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what is a flat/ critical universe?

why might the expansion be speeding up?

why do hotter stars tend to have more mass and be more luminous?

according to the staffan-boltzmann law, as the temperature of a body increases...

weins law tells us that...

why are values for luminosity not as accurate as we would like?

what is the main sequence?

why are their fewer stars in other parts of the HR diagram?

why don't we see many blue super giants on the HR diagram?

what is a protostar?