Which of the following is evidence for the existence of "dark matter" in the universe? The rate of expansion of the universe is speeding up. Stars eventually use up their fuel and stop shining. The outlying stars in a galaxy appear to rotate more rapidly than expected. The background temperature of the universe is 3K/

The outlying stars in a galaxy appear to rotate more rapidly than expected.

Explanation:

dark matters are considered  as substances that do not absorb or reflect light , and cannot directly be seen, but interacts through gravity with matters that can be seen.

It has been discovered that their existence  is based on their effect on visible objects.

In this case, the outer parts of galaxies rotate about their centers at unexpected velocities. These velocities indicate that there are massive halos around each galaxy made of matter invisible to astronomers.

answer(c) carved on a babylonian clay tablet that showed earth as a flat circular disk;