Nebula originated by the explosion

Nebula originated by the explosion of the star that gave rise to the neutron star called Cas A. In the figure we see a small representation of the inner layers of ultra-dense celestial object. The innermost part of the nucleus is formed in which the superfluid neutron and from which the beams of neutrinos, escaping to the outside, causing a drastic loss of temperature. A kind of "cold" nuclear.