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So we know the Universe is big, but exactly how large is it? And if it has been constantly expanding since the Big Bang, then how big is it now? Bend your mind around the truly massive scale of our cosmos with Dr Becky Smethurst. Best of Earth Science: http://bit.ly/EarthLabOriginals Best of BBC Earth: http://bit.ly/TheBestOfBBCEarthVideos This ...
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