If a galaxy's overall mass-to-light ratio is 100 solar masses per solar luminosity,and its stars account for only 5 solar masses per solar luminosity,how much of the galaxy's mass must be dark matter?

Question

Quizplus · Accepted Answer

We know that the galaxy's overall mass-to-light ratio is 100 solar masses per solar luminosity, which includes both visible and invisible matter. However, we also know that the visible stars account for only 5 solar masses per solar luminosity. Therefore, the remaining 95 solar masses per solar luminosity must be due to the presence of dark matter. This means that approximately 95% of the galaxy's total mass must be made up of dark matter. Hence, the correct choice is B) 95 percent.

If a Galaxy's Overall Mass-To-Light Ratio Is 100 Solar Masses