Understanding the Universe: Mass, Sigma-Eight, and Cosmological Tensions

Why is the question 'how much does the universe weigh?' considered nonsensical?

• Because the universe has no mass.

• Because the universe is constantly expanding.

• Because weight is dependent on gravity, which doesn't apply in space.

• Because the universe is too large to measure.

What is the concept of sigma-eight related to?

• The speed of light in a vacuum.

• The gravitational pull of black holes.

• The density and clumping of matter in the universe.

• The total energy of the universe.

Which method uses the cosmic microwave background to measure sigma-eight?

• Weak gravitational lensing.

• Cosmic ray analysis.

• Cosmic microwave background (CMB) observations.

• Dark matter mapping.

What is the sigma-eight tension?

• A discrepancy in the universe's expansion rate.

• A difference in sigma-eight values obtained from different methods.

• A conflict between dark matter and dark energy theories.

• A variation in the density of black holes.

What could the sigma-eight and Hubble tensions potentially lead to?

• A new theory of relativity.

• A revision of the standard model of cosmology.

• The end of the universe.

• The discovery of new galaxies.