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The image is of a spiral galaxy NGC 4414, about 60 million light years from us. It is about 50 thousand light years in diameter. Source: Wikipedia
Some other facts (estimates?) about galaxies:
- Our galaxy, the Milky Way, contains about 100 billion planets
- The universe contains about 170 billion galaxies
- The space between galaxies is a very thin gas at about one atom per cubic meter
- The most distant galaxy is about 13.4 billion light years from us
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