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Questions about Spiral Galaxies
How did spiral galaxies become spiral galaxies?
How are elliptical galaxies different from spiral galaxies?
Will elliptical galaxies eventually become spiral galaxies?
Are disk galaxies older spiral galaxies or vice versa?
Why do spiral galaxies often appear blue?
What are some examples of spiral galaxies?
How are spiral galaxies classified by astronomers?
Why are spiral galaxies more prevalent today?
Why do many spiral galaxies form a bar in the center?