What Is the Difference Between Dark Matter and Dark Energy

question 71

Multiple Choice

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.

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Definitions:

Afferent Vessels

Blood vessels that carry blood toward a particular organ or tissue, often referring to the vessels entering an organ.

Efferent Vessels

Blood vessels or lymphatic vessels that carry fluid away from an organ or tissue, as opposed to afferent vessels that bring fluid to it.

Lymphatic Vessels

A network of conduits through which lymph, containing immune cells and waste, is transported.

Secondary Antibody

An antibody that binds to a primary antibody as part of a detection or purification method in biochemistry or microscopy.