calculate the main sequence lifetime of (a) a 4M☉ star, and (b) a 0.75M☉ star. Express the lifetimes of these stars as multiples of the Sun's lifetime(t☉=10^10years), as well as in units of years.
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calculate the main sequence lifetime of (a) a 4M☉ star, and (b) a 0.75M☉ star. Express the lifetimes of these stars as multiples of the Sun's lifetime(t☉=10^10years), as well as in units of years.
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