Star clusters are important to our study of the lives of high-mass versus low-mass stars because
a. stars in each cluster all formed at about the same time all with the same mass.
b. the Sun was once a member of a globular cluster.
c. stars in each cluster all formed at about the same time but with differing masses.
d. stars in each cluster all formed at different times with differing masses.
e. All of the other choices are correct.
Question 2Due to the extremely rapid orbital velocities of material near the center of many galaxies, these galaxies are believed to contain _______________ at their centers.
Fill in the blank(s) with correct word
Question 3Open clusters tend to be ____ than globular clusters.
a. younger and contain fewer stars
b. younger and contain more stars
c. older and contain fewer stars
d. older and contain more stars
e. more luminous and cooler
Question 4_____________ galaxies have a definite disk component, but contain no evidence of spiral pattern, few hot young stars, and little gas and dust.
Fill in the blank(s) with correct word
Question 5Helium fusion is called the triple-alpha process because
a. the helium nucleus is known as an alpha particle.
b. it occurs very rapidly.
c. it requires a temperature three times greater than that of hydrogen fusion.
d. it is the third source of the primary fusion processes.
e. each reaction produces three carbon nuclei.
Question 6Measuring the Doppler shift of material at various distances from the center of a galaxy can be used to construct a(n) ________________ for that galaxy.
Fill in the blank(s) with correct word
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