Question

final exam begin date: 12/5/2025 12:01:00 am due date: 12/13/2025 11:59:00 pm end date: 12/13/2025 11:59:00 pm problem 11: (2% of assignment value) according to our textbook, roughly what percent of the mass and energy contents of the universe is made up of dark matter plus dark energy? please select the best choice from the available options. astronomers have no way of estimating this percentage 5 percent 50 percent 95 percent 10 percent

Explanation:

In the field of astronomy (a subfield of Natural Science: Physics or Astronomy, but since Physics is listed and astronomy is related to physics), the current understanding is that ordinary matter (baryonic matter) makes up about 5% of the universe's mass - energy content, while dark matter and dark energy together make up about 95% (dark matter ~27%, dark energy ~68%, so combined ~95%). So the correct option is the one with 95 percent. Wait, but the selected option in the image is 10 percent, which is incorrect. The correct answer should be 95 percent. Let's re - check: The standard model of cosmology (Lambda - CDM model) states that the universe is composed of about 5% ordinary matter, 27% dark matter, and 68% dark energy. So dark matter plus dark energy is 27%+68% = 95%.

Answer:

95 percent (the option with "95 percent")