On the Hubble Tuning Fork Diagram Shown in Figure 13-33

question 245

Multiple Choice

On the Hubble tuning fork diagram shown in Figure 13-33 of Comins,Discovering the Essential Universe,6th ed.,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.

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