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27: How to Build a Galaxy
The Supermassive Podcast
How Much Do We Know About the Milky Way?
Our galaxy is 13.6 billion years old, so a bit 200 million years after the Big Bang. It's got spiral arms stretching out from this central bar. The whole thing is, depending on how you measure it, 200,000 light years across possibly bigger if you include all this halo around it. And as many as 400 billion stars. So really, really big numbers.
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