The lifetime of a star can be estimated in "solar lifetimes" by dividing 1 by the mass of the star, raised to the 2.5 power (t-1/m5 where mass is given in solar masses. what is the expected lifetime of a star that has three times the mass of the sun? 7-[)solar lifetimes

641500299.1 years

Explanation:

Stellar lifetime

where,

= Mass of sun

M = Mass of star =

The expected lifetime of a star which is 3 times the mass of the sun is 641500299.1 years

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.