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Want facts and want them fast? Our Maths in a minute series explores key mathematical concepts in just a few words.
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Why can't there be large quantities of matter too far away to see, yet close enough that its gravity is affecting those objects far away from us that we CAN see, pulling them away from us? That, if we knew their location and quantity, may well fit with Einstein's gravity. For that matter what if the quantity of that matter is practically infinite, being left over from previous big bangs and expansions?