Which occurrence would contradict the big bang theory? the percentage of carbon dioxide in earth’s atmosphere increases. scientists discover that 99% of the universe’s mass is hydrogen. a radio telescope detects microwave radiation in space. distant galaxies move progressively farther away from earth.

The correct answer should be Distant galaxies move progressively farther away from Earth

According to the Big Bang theory, the universe is constantly expanding and stars and galaxies and entities are moving away from each other. If a galaxy was to be moving towards earth, then that would contradict it since it should be going away from the earth and away from each other until one day the cooling begins.