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  How do we know what the Milky Way looks like? 

 Directly mapping the Milky Way is an extremely challenging task, but observations of other galaxies helped us piece together what our home galaxy looked like. 

https://cdn.mos.cms.futurecdn.net/cUnCVWm2sE4wZQGyXJJVNZ.jpg

https://www.space.com/how-do-we-know-what-milky-way-looks-like