This is currently the largest observable density of a stable object in our universe – the pulsar PSR J1614−2230 Posted on 2020/11/02 by Carl Robitaille This is currently the largest observable density of a stable object in our universe – the pulsar PSR J1614−2230. pic.twitter.com/S5bG24TVKI— Fermat's Library (@fermatslibrary) November 2, 2020