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How better to celebrate American Thanksgiving-day-eve than by watching a live recording of Astronomy Cast. They're starting in just a few minutes :)
 
This is our second live episode of Astronomy Cast we're recording today. Watch +Pamela Gay and +Fraser Cain record the episode live, and then stick around after to ask your questions about this topic, or any topic in space and astronomy.

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In order to allow for a static Universe, Albert Einstein introduced the concept of the Cosmological Constant Lambda to make the math work out. Once it was discovered that the Universe was actually expanding, he threw the number out calling it his "biggest blunder". But thanks to dark energy, the Cosmological Constant is back.
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