Final answer:
The statement is false; the Sun will not lose more than 15% of its mass due to solar wind during its main sequence phase. The mass loss due to solar wind is insignificant compared to the Sun's total mass.
Step-by-step explanation:
The statement that more than 15% of the Sun's mass will be lost as the solar wind during the main (hydrogen burning) part of its life is false. Although the solar wind causes the Sun to lose about 1-2 million tons of material each second, relative to the Sun's total mass, this loss is insignificant. The Sun's main-sequence lifetime mass loss due to solar wind is much less than 15%. On the other hand, during its main sequence, the Sun converts about 10% of its hydrogen into helium, with a small fraction of this mass being converted into energy according to Einstein's mass-energy equivalence (E=mc2). Consequently, the combined effect of solar wind and fusion over the Sun's lifetime causes a mass loss, but this does not exceed 15%.