What is the difference between dark matter and dark energy? A) Dark matter exists today, whereas dark energy existed only until the strong nuclear force became a separate force at the Planck time. B) Dark energy is the energy emitted by dark matter, much as luminous energy (light) is emitted by visible matter. C) There is no difference: Energy has mass by E = mc², and dark matter and dark energy are two names for the same effect. D) Dark matter is attractive and slows the universal expansion, whereas dark energy is repulsive and accelerates the universal expansion.

Question

Quizplus · Accepted Answer

Dark matter and dark energy are fundamentally different in their effects on the universe. Dark matter acts through gravity to pull matter together, thereby slowing the expansion of the universe. In contrast, dark energy works against gravity to accelerate the expansion of the universe.

What Is the Difference Between Dark Matter and Dark Energy