(Answered) At one time the protostar that became our sun had a surface

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At one time, the protostar that became our Sun had a surface temperature of about 3000K and a radius about 25 times that of the present-day Sun. How much more (or less) luminous, compared to today, was our Sun when it was a protostar? At what distance would you have to be from the protostar for it to have the same brightness as the Sun seen from Earth today?

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