Question

in 1998, scientists discovered that the expansion of the universe has been accelerating. what force is causing this phenomena?
○ dark energy
○ hubbles law
○ the doppler effect
○ background radiation

Explanation:

Dark energy is a hypothetical form of energy that is thought to be responsible for the accelerating expansion of the universe. Hubble's law describes the relationship between the distance of galaxies and their recession velocity. The Doppler effect is related to the change in frequency of waves due to relative motion. Background radiation is the after - glow of the Big Bang.

Answer:

A. dark energy