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@morganism During a supernova, the core will collapse until it reaches nuclear densities. At this point, material will continue to fall in, producing a shock that propagates outward — the bounce. This shock releases a burst of subatomic particles known as neutrinos. The energy of the neutrinos tells us about the physics of the bounce.

Before the light from SN 1987A arrived, several neutrino detectors on Earth observed such a burst, in agreement with models.

Fig from: https://doi.org/10.1007/978-3-319-96854-4_12