Understanding Dark Energy and the Timescape Model

What is the primary force believed to be causing the universe's accelerated expansion?

• Cosmic rays

• Gravitational waves

• Dark matter

• Dark energy

According to the timescape model, what varies across different regions of the universe?

• The density of dark matter

• The flow of time

• The speed of light

• The strength of gravity

How do Type 1-a supernovae help scientists measure the universe's expansion?

• By emitting gravitational waves

• By providing a standard measure of brightness

• By altering the cosmic microwave background

• By changing the speed of light

What is a key difference between the Lambda-CDM model and the timescape model?

• Lambda-CDM includes a cosmological constant, while timescape does not

• Timescape uses quantum mechanics, while Lambda-CDM uses classical physics

• Timescape relies on dark matter, while Lambda-CDM does not

• Lambda-CDM predicts a shrinking universe, while timescape predicts expansion

What is the 'Hubble tension' in the context of cosmic expansion?

• A debate about the age of the universe

• A disagreement over the existence of dark matter

• A conflict between quantum mechanics and general relativity

• A discrepancy in the measured and predicted expansion rates