Which one of these occurrences has NOT been observed as evidence of colliding galaxies?
A) very strong X-ray emission coming from rich clusters of galaxies
B) starburst galaxies that contain hot gas, many newborn stars, and relatively young globular clusters
C) streams of hydrogen gas connecting two or more galaxies
D) distribution of black hole candidates throughout a galaxy suggesting many star mergers as a result of a galactic collision

Question

Quizplus · Accepted Answer

The distribution of black hole candidates throughout a galaxy suggesting many star mergers as a result of a galactic collision has not been observed as evidence of colliding galaxies. The other options (A, B, C) are phenomena associated with the interactions and consequences of galaxies colliding or interacting.

Which One of These Occurrences Has NOT Been Observed as Evidence