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.
Answer:B
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.