From symmetrymag https://twitter.com/symmetrymag on Twitter: Since they can't conduct experiments on stars and planets, cosmologists use data from the afterglow of the Big Bang to model conditions of the early universe: https://t.co/krnnasHkeR https://twitter.com/symmetrymag/status/992772670549843969/photo/1 https://chirp.cooleysekula.net/attachment/50379