Which of the following statements is true? A. Blue main sequence stars are distributed more uniformly on the disk of the Milky Way than Red main sequence stars. B. The older the star, the lower its abundance of heavy elements. C. The younger the star, the higher its mass. D. About 5 per cent of the matter of the Milky Way is in the form of dust grains.
Which of the following statements is true?
A. Blue main sequence stars are distributed more uniformly on the disk of the Milky Way than Red main sequence stars.
B. The older the star, the lower its abundance of heavy elements.
C. The younger the star, the higher its mass.
D. About 5 per cent of the matter of the Milky Way is in the form of dust grains.
Is A the true statement? Since the disk component of the Milky way (spiral galaxy) is where blue/white massive new stars are formed while the spheroidal component is where the older red/yellow stars are found, blue stars are uniformly distributed on the disk of the Milky Way?
For B, is that the mass but not the age of the star determines the abundance of heavy elements?
For C, is that the star age has nothing to do with its mass?
For D, may I know the true percentage of dust grains of the Milky Way?
Many thanks!
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