The Disks of Spiral Galaxies Appear Blue Because

question 20

Multiple Choice

The disks of spiral galaxies appear blue because

• A) they are moving toward us.
• B) they contain a relatively high concentration of low-mass stars.
• C) they contain active regions of star formation.
• D) they contain more metals that, when ionized, emit blue light.
• E) stars collide with each other frequently in these dense regions and explode as Type Ia supernovae.

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