galaxy M101 is one of over 200 billion known galaxies in the universe.<br />
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This giant...
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Eric J
galaxy M101 is one of over 200 billion known galaxies in the universe.

This giant spiral disk of stars, dust and gas is 170,000 light-years across, or nearly twice the diameter of our Milky Way galaxy. M101 is estimated to contain at least one trillion stars. About 100 billion of them could be similar to our Sun.

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