Astronomy > QUESTIONS & ANSWERS > Whatcom Community CollegeASTRONOMY 100astronomy week 4 (All)
Whatcom Community CollegeASTRONOMY 100astronomy week 4
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Astronomy 100, Week 4 Quiz. NAME__________________________ 1. The composition of interstellar gas (by mass percentage) is mainly a. helium and hydrogen * b. carbon, nitrogen, and water vapor molecu... les c. hydrogen and carbon d. nitrogen and oxygen 2. A cloud of 0.20 of solar mass cannot form a "star" because a. there is not enough mass present to overcome thermal motion. b. the cloud is too thin and radiates all its energy to space. c. the release of gravitational energy during collapse cannot heat the core to high enough temperature. d. Nonsense - we know of many 0.20 solar mass stars. 3. Why do we find more M type stars than B type stars. a. it is easier to make cool low mass stars than hot high mass stars. b. hot high mass stars have much longer lifetimes.* c. the hotter stars form mostly at very great distances from us, so we see fewer of them. d. nonsense, we find mo [Show More]
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