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I've read that the observable Universe has a 45 billion ly radius - how can that be if the Universe is only 13.7 billion years old?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
I've read that the observable Universe has a 45 billion ly radius - how can that be if the Universe is only 13.7 billion years old?	65
Has Cancer been with us through the ages, or is Cancer a Civilizatory Disease?	5