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Date: 2010-09-28 11:30 am (UTC)I remember a 1st-year undergrad astronomy practical where I ended up estimating the mass of the Sun at around 1030Kg +/- 1031Kg. There may have been a slight error in the error calculation :)
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Date: 2010-09-28 11:55 am (UTC)It's a value you add to your answer which is automatically the amount it needs to be to make the answer correct.
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Date: 2010-09-28 11:54 am (UTC)