This is currently the largest observable density of a stable object in our universe – the pulsar PSR J1614−2230. Posted on 2021/09/10 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/6uC811Tk9W— Fermat's Library (@fermatslibrary) September 1, 2021