The Cosmic Microwave Background (CMB) from our perspective The CMB defines the size of our observable universe, stretching ~46.5 billon light years across The Milky Way is .003 times as small as the glowing blue dot at the center, which itself is ~230 million light years acrosspic.twitter.com/f6jzgtBpm5
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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Where did the factorial enter the measurement--why 2! versus 2?
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2 excitement not 2 factorial
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