Intryingtocomprehendouruniverse,justhowbigisbigHowfarisfarThisusersguidetothecosmoswillbringtheincomprehensibledowntoahumanscalesuchasVenusmeltingatank,thedensityofablackholecomparedto1000carsinaCokecan,andthecometsintheSolarSystemequatedtograinsofsugarweighinghalfaton