Use the graph above showing data for the brightest galaxies in clusters of galaxies to answer the following question. If new studies show that the exceptions are a class of galaxies with extraordinarily bright centers, which conclusion is not justified based on the plot and the findings of these new studies?
A)Bright nuclei were more common long ago, since the light from more distant galaxies has been traveling much longer.
B)Bright nuclei are caused by supermassive black holes surrounded by hot gas.
C)Bright nuclei are more common in cluster galaxies that are farther away.
D)Galaxies appear redder the farther away they are.

Question

Quizplus · Accepted Answer

Explanation: The presence of bright nuclei in galaxies, as indicated by the new studies, does not directly imply the cause of these bright nuclei. While supermassive black holes surrounded by hot gas can cause bright nuclei, this conclusion requires additional evidence beyond the observation of bright nuclei themselves. The other options (A, C, D) relate to observations that can be inferred from the data on the brightest galaxies in clusters (e.g., distance, appearance, and commonality of bright nuclei), but option B assumes a specific cause that is not justified solely by the data on brightness.

Use the Graph Above Showing Data for the Brightest Galaxies