Supernova 1987A is the first supernova visible to the naked eye since Kepler's Supernova in 1604, the only one since the advent of modern telescopes. As a result, Supernova 1987A is a critical source of information related to stellar evolution and one of the most intensely studied astrophysical systems to date. Despite decades of intense research, the mechanism responsible for the formation of the clumps along the equatorial ring illuminated by the supernova blast is unknown. We propose a hydrodynamic mechanism, the same one that breaks up airplane condensation trails, that predicts a number of clumps remarkably consistent with observations, essentially solving this nearly four-decades-old problem of great scientific interest.
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