<p><span style="font-size: 16px;">As you watch, answer the following questions:</span></p>
<p><span style="font-size: 16px;">1. How do we know that the universe is expanding?</span></p>
<p><span style="font-size: 16px;">2. Describe Hubble's Law.</span></p>
<p><span style="font-size: 16px;">3. How do galaxies move?</span></p>
<p><span style="font-size: 16px;">4. Why do galaxies move?</span></p>
<p><span style="font-size: 16px;">5. How is dark energy impacting our universe?</span></p>
<p><span style="font-size: 16px;">6. How do we know that we are not at the center of the universe?</span></p>
<p>&nbsp;</p>
<p><span style="font-size: 16px;"><iframe src="https://www.youtube.com/embed/BIW7EzHmndY?wmode=opaque" width="420" height="315" frameborder="0" allowfullscreen=""></iframe></span></p>