Posted by Sara on Monday, March 1, 2010 at 1:08pm.
Thee is information in these sites:
http://www.google.com/search?q=why+elliptical+galaxies+are+considered+older+than+spiral+galaxies&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a
Sra
They are considered to be older because they have little instellar matter and because they rarely form new stars like the other galaxies do. They seem to be more evolved than the spiral galaxies because they actually are thought to form within the clusters. The spiral galaxies consist of older stars in the center cluster.
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