Edwin Hubble's discovery that the Milky Way is just one of many galaxies fundamentally changed our understanding of the universe and our place in it. What other important discovery did Hubble make that changed our understanding of the universe? Hubble discovered that the Sun is at the center of our solar system. Hubble discovered that all galaxies are moving away from us, which is evidence of the big bang. Hubble discovered the first exoplanet. Hubble discovered that the universe is infinite.

## Step 1<br />The problem is a multiple-choice question about Edwin Hubble's significant contributions to our understanding of the universe. The question asks for another important discovery made by Hubble that changed our understanding of the universe.<br /><br />## Step 2<br />The options provided are:<br />- Hubble discovered that the Sun is at the center of our solar system.<br />- Hubble discovered that all galaxies are moving away from us, which is evidence of the big bang.<br />- Hubble discovered the first exoplanet.<br />- Hubble discovered that the universe is infinite.<br /><br />## Step 3<br />The first option is incorrect because the discovery that the Sun is at the center of our solar system was made by Copernicus, not Hubble.<br /><br />## Step 4<br />The second option is correct. Hubble's discovery that all galaxies are moving away from us provided evidence for the Big Bang theory, which is a fundamental shift in our understanding of the universe.<br /><br />## Step 5<br />The third option is incorrect because the discovery of the first exoplanet was not made by Hubble.<br /><br />## Step 6<br />The fourth option is incorrect because the discovery that the universe is infinite was not made by Hubble.