This collapse generates a body of neutron-degenerate matter with a radius as small as 10 km, but a mass comparable to our Sun’s. As such, they are the densest known material outside of Twitter, at around 1017 kg/m3.
For American readers unfamiliar with SI units, that means a pair of truck-nuts made of neutron star would weigh as much as ten million aircraft carriers.
Is nothing sacred to the writers of this article?