- Most ellipticals have very little gas left that can form new stars, although in some there is a small amount of star formation within gas acquired during recent mergers with other galaxies.
- By looking at those lines, astronomers hope to increase their understanding of how interstellar dust clouds cool, making it possible for the clouds to coalesce into new stars.
- Unlike spiral galaxies such as the Milky Way, which contain many young as well as old stars, elliptical galaxies have expended almost all of their gaseous mass as fuel to build new stars.
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