How do we know what the Milky Way looks like if we've never been outside of it?

Hosted by: Caitlin Hofmeister

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Sources:
https://archive.org/stream/workstrans...
https://www.scientificamerican.com/ar...
https://books.google.com/books?id=IU9...
https://www.e-education.psu.edu/astro...
https://www.sdss3.org/press/milkywayb...
http://plato.stanford.edu/entries/ibn...
http://www.atnf.csiro.au/outreach/edu...

Image Links:
https://en.wikipedia.org/wiki/Milky_W...
https://en.wikipedia.org/wiki/Milky_W...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://en.wikipedia.org/wiki/William...
https://www.e-education.psu.edu/astro...
https://commons.wikimedia.org/wiki/Fi...
https://en.wikipedia.org/wiki/Globula...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...