The hammerfall was a spherical shock wave of hydrogen plasma, blazing at a temperature of millions of degrees and compressed until it had many of the properties of metal. A hundred times as massive as the largest gas giant in the star system, by the time it slammed into the crystal of iron at the heart of the murdered star it was traveling at almost 2 percent of lightspeed. When it struck, a tenth of the gravitational potential energy of the star was converted into radiation in a matter of seconds. Fusion restarted, exotic reactions taking place as even the iron core began to soak up nuclei, building heavier and hotter and less stable intermediaries. In less than ten seconds, the star burned through a visible percentage of its fuel, enough to keep the fires banked for a billion years. There wasn't enough mass in the G-type dwarf to exceed the electron degeneracy pressure in its core, collapsing it into a neutron star...