Astrophysics and Cosmology Physics Alevel

What does the expansion of the universe refer to?

• The universe is contracting over time.

• The universe is expanding at a constant rate.

• The universe is expanding, and the rate of expansion is accelerating.

• The universe is static and unchanging.

Tags

NGSS.HS-ESS1-2

What evidence supports the theory of the expanding universe?

• The Doppler effect

• The discovery of exoplanets

• The cosmic microwave background radiation

• Both A and C

Tags

NGSS.HS-ESS1-2

What is dark energy believed to be responsible for?

• The gravitational pull between galaxies

• The acceleration of the universe's expansion

• The formation of black holes

• The rotation of galaxies

Which of the following best describes dark matter?

• Matter that emits no light and cannot be directly observed

• Matter that consists of black holes and dark stars

• Matter that can only be seen with infrared telescopes

• Matter that is found only in the cores of galaxies

How does dark matter affect the universe?

• It causes the universe to expand.

• It has no effect on the universe.

• It contributes to the overall gravity and structure of the universe.

• It slows down the expansion of the universe.

How do scientists estimate the amount of dark matter in the universe?

• Through direct observation with telescopes

• By measuring the rotation curves of galaxies

• By detecting the light emitted by dark matter

• By measuring the temperature of the cosmic microwave background

What is the percentage of dark matter in the universe?

• 68%

• 5%

• 55%

• 28%

What role does dark energy play in the fate of the universe?

• It will cause the universe to eventually collapse.

• It has no effect on the fate of the universe.

• It may cause the universe to expand forever.

• It will cause the universe to oscillate between expansion and contraction.

Which observation suggests that the expansion of the universe is accelerating?

• The uniform distribution of galaxies

• The redshift of light from distant galaxies

• The motion of planets in our solar system

• The presence of cosmic microwave background radiation

Tags

NGSS.HS-ESS1-2

What is the significance of the cosmic microwave background radiation in the study of the universe?

• It provides evidence for the Big Bang theory.

• It indicates the presence of dark matter.

• It shows the universe is contracting.

• It disproves the theory of general relativity.

Tags

NGSS.HS-ESS1-2