The expansion of the universe is accelerating rather than simply coasting. The discussion connects that observation to dark energy and distinguishes it from the separate question of dark matter.
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1:51:15Now we move on still in 98 discovery of cosmic acceleration. Something we've touched on in a variety of different components here. >> We've talked about dark matter. >> Yes. But we also know that most of the universe is actually dark energy. This is where dark energy was discovered. Um Saul Pearl Pearl Motor at Lawrence Berkeley National Lab, um Brian Schmidt at in Australia, and Adam Ree at the Space Telescope Institute in Baltimore, they showed that the acceleration they showed that the expansion of the universe is accelerating. The universe is getting bigger and someone's pumping on the gas. It's not coasting. Mhm. >> That's very weird. >> Yes. >> Okay. That's where dark energy comes
1:51:57from. They shared the 2011 Nobel Prize in physics.