Give 2 reasons y elliptical galaxies are considered to be older & more evolved than spiral galaxies.
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.
Please tell me if this is good; more info would be appreciated, thanks
Universe and the Stars-Please Check - bobpursley, Monday, March 1, 2010 at 9:54pm
IT is ok, but one thing is the color of the stars is telling: clusters consist of yellow, red stars, not the hot blue stars. That in itself indicates an older system.