What the definition of dark energy

Question

Energy that humans cannot observe directly
Energy that has a small effect on the universe
Energy characterized by black and dark gray colors
Energy that is only emitted by glowing nebulae

Answer 1

The correct definition of dark energy is:

Energy that humans cannot observe directly.

Dark energy is a mysterious form of energy that makes up a significant portion of the universe and is thought to be responsible for the accelerated expansion of the universe. While it cannot be observed directly, its effects can be inferred from astronomical observations.