Which Is One Reason That the Typical Galaxy's Mass-To-Light Ratio

question 27

Multiple Choice

Which is one reason that the typical galaxy's mass-to-light ratio (in units of the Sun's mass over the Sun's luminosity) generally greater than 1?

• A) galaxies contain mostly stars much brighter than the Sun
• B) galaxies contain mostly stars much more massive than the Sun
• C) galaxies contain many more stars that shine much less brightly than the Sun
• D) most of the mass in a galaxy is in the form of dust
• E) this is an unsolved problem in astronomy; scientists have no clue

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