In 1987, a supernova exploded in our nearest neighbor galaxy. The rest was released as neutrinos and kinetic energy to explode the star. Most of the initial luminosity is the shell of the star expanding outward and cooling. After a few hundred days, this shell of expanding gas has cooled to be almost invisible and the light we see at this point is due to the radioactive decay of nickel and cobalt produced by nucleosynthesis during the explosion. The collapse of a supernova core produces a flood of those very strange particles, neutrinos.
Neutrinos interact very weakly with matter.
Under most conditions, matter is transparent to neutrinos. During the high densities of a supernova core collapse, some of the neutrinos provide the pulse to starts the outward moving shock wave. But most of the neutrinos zip out of the supernova core. Thus, when a supernova explodes, huge numbers of neutrinos pour into space, streaming across the Galaxy passing through dust, gas, nebula unhindered. Even if the supernova is obscured, the neutrinos will rain down on the Earth.