Evidence for the existence of dark matter includes ________.
A)the observation that Mercury rotates about the Sun faster than Pluto
B)the observation that the universe is not expanding as fast as predicted by Big Bang Theory
C)the observation that stars near the center of galaxies do not rotate as fast as expected
D)the observation that the universe appears to be slowing down

Question

Quizplus · Accepted Answer

The observation that stars near the center of galaxies do not rotate as fast as expected is evidence for the existence of dark matter. This discrepancy can be explained if there is extra mass in the galaxies that we cannot directly observe, which is known as dark matter.

Other options (A, B, and D) are not directly related to the evidence for the existence of dark matter. The observations mentioned in options A and D can be explained by other phenomena, such as relativistic effects or the decelerating expansion of the universe. Option B is also incorrect since the observation is actually the opposite: the universe is expanding faster than predicted by Big Bang Theory, and this is explained by the existence of dark energy, not dark matter.

Evidence for the Existence of Dark Matter Includes ________