[Answer] In the 1920s, Edwin Hubble made what revolutionary discovery?

Step 1 : Introduction to the question "In the 1920s, Edwin Hubble made what revolutionary discovery?"

...American astronomer Edwin Hubble completely changed the way we viewed outer space. Before then, we knew a lot about our home galaxy, the Milky Way, but had no solid evidence of other galaxies beyond our own. While looking through his 100-inch telescope at Mount Wilson in Southern California, Hubble noticed that the “Andromeda Nebula” (now called the Andromeda Galaxy) had stars very similar to our galaxy, deducing that it was an entirely different galaxy. Hubble also proved that objects that were previously labeled as dust, clouds, and gas were actually more galaxies. Because of his contributions to astronomy, the Hubble Space Telescope was named after him.

Step 2 : Answer to the question "In the 1920s, Edwin Hubble made what revolutionary discovery?"

Other galaxies:

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