In General,when We Compare the Mass of a Galaxy or Cluster

question 99

Multiple Choice

In general,when we compare the mass of a galaxy or cluster of galaxies to the amount of light it emits (that is,when we look at it mass-to-light ratio) ,we expect that

• A)the higher amount of mass relative to light (higher mass-to-light ratio),the lower the proportion of dark matter.
• B)the higher the amount of mass relative to light (higher mass-to-light ratio),the greater the proportion of dark matter.
• C)the amount of light should be at least one solar luminosity for each solar mass of matter (mass-to-light ratio less than or equal to 1).
• D)the higher the amount of mass relative to light (higher mass-to-light ratio),the older the galaxy or cluster.

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