Why Do We Find a Larger Percentage of Spiral Galaxies

question 95

Multiple Choice

Why do we find a larger percentage of spiral galaxies in distant clusters compared to nearby clusters?

• A) Distant clusters are younger,and this contrast in the percentage of spirals shows evidence for the natural evolution of spirals into ellipticals.
• B) Distant clusters are older,and this contrast in the percentage of spirals shows evidence for the natural evolution of ellipticals into spirals.
• C) Over time,galactic collisions and mergers have destroyed many of the spiral arms that give spirals their distinctive appearance.
• D) Spirals contain more gas and dust than ellipticals.In older,nearby clusters,less gas and dust remain and fewer spirals are created.

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