Gaia: Mapping our Milky Way Galaxy

When you’re walking through a forest, it’s nearly impossible to know the forest’s boundaries or layout. This same idea applies with our galaxy, yet we know the Milky Way is a spiral galaxy, and we know our Sun orbits the center of the galaxy from about 26,000 light-years out. With no way to propel ourselves outside of the galaxy and look at it from that view, how have astronomers learned so much about the Milky Way? By tracking the positions and movements of stars and gas clouds. And astrono

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