In ‘The Scale of the Universe 2’, by Cary Huang, you can zoom in and look at progressively smaller objects, starting from the size of a human, through everyday objects such as an egg, down to, for example, red blood cells, chromosomes, viruses and eventually the neutrino at 10−24m. (From there until the limit of 10 −35m there is not much to see.) At the other end of the scale, after planets, stars and galaxies, the limit of the observable universe is at 10 27m:
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