It will cool into conventional matter eventually, but it would pass through a lot of exotic phases in between. I'm not sure we can even really answer that quest

It will cool into conventional matter eventually, but it would pass through a lot of exotic phases in between. I'm not sure we can even really answer that question, but here's something to give you an idea of what I mean: https://en.wikipedia.org/wiki/Quark%E2%80%93gluon_plasma https://en.wikipedia.org/wiki/Quark%E2%80%93gluon_plasma I'm not sure it would necessarily pass through that, but it would at least make a decent pass at it in those first few nanoseconds. If kmm's guesstimate of 5e26 joules is accurate, we're well beyond "extinguishing multicellular life" and in the realm of eliminating Earth entirely, which requires a minimum of 5.97e24 joules: https://en.wikipedia.org/wiki/Gravitational_binding_energy https://en.wikipedia.org/wiki/Gravitational_binding_energy 1% efficiency of transfer to the Earth is probably attainable.