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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Definitions:

Allelic Frequencies

The relative frequencies of different alleles of a particular gene within a population, which can change over time due to evolutionary pressures.

Genetic Expressions

The process by which information from a gene is used in the synthesis of a functional gene product, often leading to the manifestation of a particular trait.

Gene Pool

The total collection of different genes in an interbreeding population.

Organism's Niche

The role or function of an organism or species within an ecosystem, including its habitat, resource use, and interaction with other species.