A supernova is a colossal explosion of a star when the fuel within that star becomes too much to handle. When such a celestial event happens, the star shines brighter than an entire galaxy, but only for a celestial instant (a few weeks or months). During this time span, the star will burn more energy than our Sun will burn during its entire lifespan. Such events are uncommon. The last one observed in the Milky Way happened over 400 years ago.

In the wake of the star that has shone so brightly is left either a neutron star or a black hole. Neutron stars are tiny. One could fit in the area covered by Greater London. They are, however, very dense. One teaspoon of neutron star would weigh a billion tons. If the star going supernova is big enough, instead of ending its life as a neutron star, maybe…