2846 Many colourful stars are packed close together in this image of the globular cluster NGC 1805, taken by the Hubble Space Telescope. (ESA/Hubble & NASA, J. Kalirai) Chicago, December 23 Researchers from the Northwestern University (NU) has found that by studying all three "flavors" involved in a supernova, they have unlocked more clues as to how and why stars die. Contrary to the past practice of simplifying studies by studying one flavor while ignoring the other two, the researchers in the new study created a non-linear simulation of a "fast conversion" when three neutrino flavours are present, where a fast conversion is marked by neutrinos interacting and changing flavors.