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QUESTION
How much does the sun weigh?
has a mass of ##1,989*10^30 kg##
Weigh is a measurement for gravitational force, so you can't say the sun weights anything if you're not measuring with respect to any other mass.
So, the Sun has a mass of ##1,989*10^30 kg##, nevertheless, it's constantly losing mass because of the amount of energy it irradiates from the nuclear reactions that take place inside of it.
