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Intryingtocomprehendouruniverse,justhowbigisbig?Howfarisfar?ThisusersguidetothecosmoswillbringtheincomprehensibledowntoahumanscalesuchasVenusmeltingatank,thedensityofablackholecomparedto1000carsinaCokecan,andthecometsintheSolarSystemequatedtograinsofsugarweighinghalfatoneee