Intryingtocomprehendouruniverse,justhowbigisbig?Howfarisfar?ThisusersguidetothecosmoswillbringtheincomprehensibledowntoahumanscalesuchasVenusmeltingatank,thedensityofablackholecomparedto1000carsinaCokecan,andthecometsintheSolarSystemequatedtograinsofsugarweighinghalfaton.
