If the universe is expanding, why aren’t galaxies stretching apart? Cosmologist Adam Riess breaks down the physics behind cosmic expansion, the forces that resist it, and why dark energy dominates the vast spaces between.For more, check out the <a href="https://www.wgbh.org/podcasts/particles-of-thought/discovering-dark-energy-and-the-hubble-tension-extended-interview-with-nobel-prize-winner-adam-riess">extended interview</a> with Adam Riess.Learn more about <a href="https://www.pbs.org/wgbh/nova/">NOVA</a> and subscribe to our <a href="https://www.youtube.com/channel/UCjHz5SVHeMT0AViCYZvsGDA">YouTube </a>channel.

<description>
 &lt;p&gt;If the universe is expanding, why aren’t galaxies stretching apart? Cosmologist Adam Riess breaks down the physics behind cosmic expansion, the forces that resist it, and why dark energy dominates the vast spaces between.&lt;/p&gt;&lt;p&gt;For more, check out the &lt;a href="https://www.wgbh.org/podcasts/particles-of-thought/discovering-dark-energy-and-the-hubble-tension-extended-interview-with-nobel-prize-winner-adam-riess"&gt;&lt;strong&gt;extended interview&lt;/strong&gt;&lt;/a&gt; with Adam Riess.&lt;/p&gt;&lt;p&gt;Learn more about&lt;em&gt; &lt;/em&gt;&lt;a href="https://www.pbs.org/wgbh/nova/"&gt;&lt;strong&gt;&lt;em&gt;NOVA&lt;/em&gt;&lt;/strong&gt;&lt;/a&gt; and subscribe to our &lt;a href="https://www.youtube.com/channel/UCjHz5SVHeMT0AViCYZvsGDA"&gt;&lt;strong&gt;&lt;em&gt;YouTube &lt;/em&gt;&lt;/strong&gt;&lt;/a&gt;channel.&lt;/p&gt;
 </description>

If the universe is expanding, why aren’t galaxies stretching apart? Cosmologist Adam Riess breaks down the physics behind cosmic expansion, the forces that resist it, and why dark energy dominates the vast spaces between.

For more, check out the <a href="https://www.wgbh.org/podcasts/particles-of-thought/discovering-dark-energy-and-the-hubble-tension-extended-interview-with-nobel-prize-winner-adam-riess">extended interview</a> with Adam Riess.

Learn more about <a href="https://www.pbs.org/wgbh/nova/">NOVA</a> and subscribe to our <a href="https://www.youtube.com/channel/UCjHz5SVHeMT0AViCYZvsGDA">YouTube </a>channel.

NOVA Presents

Space-Time Expansion, Explained | Adam Riess

Space-Time Expansion, Explained | Adam Riess

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