2018年USAAAO短问题第3道

英文题目

3. [5 pt] What is the main-sequence lifetime of a star with a mass of 0.1 solar masses, and a star with a mass of 10 Solar masses? Assume that stellar luminosity, $$L ∝ M3.5$$ , where M is stellar mass, and that the main-sequence lifetime of the Sun is 10 billion years.