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Easy... it's 7e82 light years.
I'd recommend finding a really really huge object (like the estimated size of the universe). Let them get a good concept of that in their head... and then say "And that object is about 0.00...0001% the size of 2.2e99 feet."
What are you talking about that's larger than the universe, if you don't mind me asking?
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Simple Machines in Higher Dimensions
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