Pulsars In The Sky With Diamonds
“Neutron stars form from the core of a collapsing star and, as the supernova dissipates, often rotate rapidly, creating a pulsar. In less than a million years, however, their strong magnetic fields act as a brake, slowing them down considerably. In some cases, however, the neutron star will have a nearby companion, and its gravity is sufficient to start stripping mass off it.
As the process continues, the neutron star will spin back up, creating what’s called a millisecond pulsar. In most cases, these companions are still around, visible as a bright star locked in an orbital embrace with a pulsar. Now, researchers have spotted one where the star is still there, but not visible—the neutron star has stripped it down to a crystaline core the size of Jupiter…
“The chemical composition, pressure and dimensions of the companion make it certain to be crystallized (i.e., diamond).”