This image of the Cassiopeia A supernova remnant shows the aftermath of a type II, core-collapse supernova that occurred more than 350 years ago. The supernova remnant glows in a variety of electromagnetic wavelengths, but if we had been operating neutrino detectors back in ~1667 when the light (and neutrinos) first arrived, we could have determined whether there was a neutrino deficit, and a hint of dark matter in the process. (Credit: NASA/JPL-Caltech)
The last naked-eye Milky Way supernova happened way back in 1604. The next one could be the key to solving the dark matter mystery.
In all the Universe, there are few mysteries that loom as large as dark matter. We know, from the gravitational effects we observe — at all times and on…
