Dark energy

Dark energy constitutes 70% of the universe's mass energy and is responsible for the accelerating expansion of the universe, counteracting the effects of gravity. It is the most accepted explanation for these phenomena.

What percentage of the universe's mass energy is attributed to dark energy?

• 50%

• 60%

• 70%

• 80%

Why was the concept of dark energy introduced?

• To explain the slowing down of the universe's expansion

• To account for unexpected cosmic observations

• To describe the formation of galaxies

• To measure the mass of black holes

What is the current state of the universe's expansion?

• It has stopped

• It is constant

• It is accelerating

• It is slowing down

What force does dark energy work against?

• Electromagnetic force

• Nuclear force

• Gravity

• Magnetic force

What is the best explanation proposed for the accelerating expansion of the universe?

• Cosmic rays

• Dark energy

• Dark matter

• Black holes