Multiple Choice
On the Hubble tuning-fork diagram shown in Figure 17-15 of the text, the irregular galaxies are placed between the tines at the right end of the diagram. Why is this? 
A) These are the least-massive galaxies, and on the diagram the masses increase from left to right.
B) These are the youngest galaxies, and on the diagram the ages increase from right to left.
C) These are the oldest galaxies, and on the diagram the ages increase from left to right.
D) The placement is somewhat arbitrary.
Correct Answer:
Verified
Correct Answer:
Verified
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