The blue supergiant Sanduleak -69° 202a
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Blue supergiants (BSG) explode with incredible force in violent supernova explosions at the end of their massive lives. The simulation reveals an uneven, swirling cloud of material surrounding Sanduleak -69° 202, the BSG that preceded supernova (SN) 1987A's explosion. This BSG barely appears as a tiny figure in the center when you zoom in. A vibrant red-yellow doughnut shape surrounds the star; it is made up of gas collected during interactions between a slow-moving dense wind and the faster-moving wind of the BSG, which was once a red supergiant. Thin lines indicate magnetic field lines while arrows depict the velocity field of the stellar wind that flows directly towards the poles. A powerful MHD simulation was conducted using the PLUTO code. Reference: Orlando et al. 2019, A&A 622, id.A73. The stunning image of the Milky Way is courtesy of ESO/S. Brunier and INAF-Osservatorio Astronomico di Palermo.
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