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How thick is the Milky Way Galaxy?

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The Milky Way is a barred spiral galaxy, about 100,000 light-years across. If you could look down on it from the top, you would see a central bulge surrounded by four large spiral arms that wrap around it. read more

The Milky Way is on a collision course with the most massive member of the group, called M31 or the Andromeda Galaxy. The Milky Way is the second-largest member, with M33 (the Triangulum Galaxy) the third-largest, NASA says. read more

The Milky Way’s main disk is around 1,000 light years thick. Although this amount is quite massive, it is little in comparison with the 100,000 light years that is the diameter of the galaxy. So the thickness of the Milky Way is in a 1:100 ratio with the diameter. The central bulge has a different thickness than the actual disk. read more

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