What does the equivalent of an H-R diagram for galaxies,plotting luminosity versus color,show?
A)galaxies fill the diagram showing that there is no correlation between luminosity and color
B)two clumps,one blue with relatively low luminosity,one red with relatively high luminosity,and a valley in between with few galaxies
C)a continuum from faint,blue galaxies to bright,red galaxies
D)a continuum from faint,red galaxies to bright,blue galaxies
E)a main sequence,just as for stars

Question

Quizplus · Accepted Answer

The equivalent of an H-R diagram for galaxies, plotting luminosity versus color, shows two distinct clumps: one consisting of blue galaxies with relatively low luminosity and another consisting of red galaxies with relatively high luminosity, with a noticeable gap or "valley" in between where there are few galaxies. This pattern reflects differences in galaxy types, ages, and star formation rates.

What Does the Equivalent of an H-R Diagram for Galaxies,plotting