Why was the discovery of dark energy unexpected?
A) The gravity provided by the mass contained within the universe was predicted to slow the expansion.
B) The acceleration of the universe was predicted to increase.
C) Astronomers had not anticipated being able to observe supernovae at such large distances.
D) The universe was expected to lose, not gain energy.

Question

Quizplus · Accepted Answer

The discovery of dark energy was unexpected because it contradicted the then-prevailing theory that the gravity from all the mass in the universe would slow down its expansion over time. Instead, observations showed that the expansion of the universe is accelerating, indicating the presence of an unknown form of energy—dark energy—working against gravitational pull.

Why Was the Discovery of Dark Energy Unexpected