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Due to its proximity, SN 1987A offers a unique opportunity to directlyobserve the geometry of a stellar explosion as it unfolds. Here we presentspectral and imaging observations of SN 1987A obtained ~10,000 days after theexplosion with HST/STIS and VLT/SINFONI at optical and near-infraredwavelengths. These observations allow us to produce the most detailed 3D map ofH-alpha to date, the first 3D maps for [Ca II] \lambda \lambda 7292, 7324, [OI] \lambda \lambda 6300, 6364 and Mg II \lambda \lambda 9218, 9244, as well asnew maps for [Si I]+[Fe II] 1.644 \mu m and He I 2.058 \mu m. A comparison withprevious observations shows that the [Si I]+[Fe II] flux and morphology havenot changed significantly during the past ten years, providing evidence that itis powered by 44Ti. The time-evolution of H-alpha shows that it ispredominantly powered by X-rays from the ring, in agreement with previousfindings. All lines that have sufficient signal show a similar large-scale 3Dstructure, with a north-south asymmetry that resembles a broken dipole. Thisstructure correlates with early observations of asymmetries, showing that thereis a global asymmetry that extends from the inner core to the outer envelope.On smaller scales, the two brightest lines, H-alpha and [Si I]+[Fe II] 1.644\mu m, show substructures at the level of ~ 200 - 1000 km/s and cleardifferences in their 3D geometries. We discuss these results in the context ofexplosion models and the properties of dust in the ejecta.

Three-dimensional distribution of ejecta in Supernova 1987A at 10 000 days