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Our Milky Way

Our home galaxy is normal sized for a barred spiral galaxy. The bar has a diameter of about 27 000 light-years. From its ends two large spiral arms arise. In its center is the black hole Sagittarius A*.

Age: 12 billion years
Number of Stars: 100 - 200 billion
Diameter: 100 000 light-years
Type: SBb or SBc

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Graphic: R. Hurt (SSC), JPL-Caltech, NASA

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