ISP test 3 - Q. What about a star cluster would lead to a...

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Q. What about a star cluster would lead to a determination that it has an old age? A. The absence of bright, blue stars. Q. Why would a universe with only low-mass stars be unfavorable for life in that universe? A. Because high-mass stars are critical producers of many elements necessary for life as we know it. Q. Stars on the main sequence produce their energy by A. fusion of Hydrogen into Helium. Q. Where did the iron and other heavy elements in the universe come from? A. They were produced by nuclear reactions that occur inside massive stars. Q. The order of the stages of evolution a star like our Sun goes through is A. main sequence, red giant, white dwarf. Q. The most massive stars A. have the shortest lives. Q. When a star settles down to a stable existence as a main-sequence star, what characteristic determines where on the main sequence in an H-R diagram the star will fall? A. its mass. Q. Why are parallax (triangulation) measurements limited to only nearby stars? A. The shift in the apparent position of a star in the sky at different times of year is too small to measure for distant stars. Q. One of the brightest stars in the sky is Betelgeuse even though it is *not* one of the closest stars to the Sun. What can we infer about Betelgeuse then? A. It has a high luminosity (intrinsically bright). Q. Which types of stars evolve so they have iron cores and may explode as supernovae?
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ISP test 3 - Q. What about a star cluster would lead to a...

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