If we have just arrived in the Universe and are searching for a likely place to find life. Letís review a wide range of Galaxies to see if we can pick a good place to search.
The galaxies we see in the Universe today are classified according to their shape. Most are mostly either elliptical (about 30%) or spiral (about 70% of galaxies). A few are other shapes. Because we do not understand the origin of galaxies, is not clear how these different shapes arose.
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398 pages, 300 images
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