Edwin Hubble, Doppler Shift, and the Expanding Universe

So we've made it all the way to the 20th century with the history of astronomy. Plenty had to happen to get us to that point, but the most amazing stuff is yet to come! Shortly after Einstein did his best work, a guy named Edwin Hubble demonstrated that what we thought was the entire universe was actually just one little island of stars out of billions of other galaxies. And that's just the tip of the iceberg! The universe is also expanding! What does all this mean for cosmology? Let's find out.

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