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发帖数: 1994 | 1 M101: The Pinwheel Galaxy
Credit & Copyright: Jean-Charles Cuillandre (CFHT), Hawaiian Starlight, CFHT
Explanation: Why do many galaxies appear as spirals? A striking example is M101, shown
above, whose relatively close distance of about 22 million light years allow it to be studied in
some detail. Recent evidence indicates that a close gravitational interaction with a
neighboring galaxy created waves of high mass and condensed gas which continue to orbit the
galaxy center. These waves compr |
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