A new analysis of one of the most famous explosions in the cosmos has revealed a curious asymmetry.
Part of the inner nebula of the Cassiopeia A supernova remnant is not, astronomers have found, expanding evenly.Something has caused a section of the cloud to move, not outwards with the rest of the material, but inwards, back towards the source of the explosion: a reverse shock.of the University of Amsterdam in the Netherlands.
Cassiopeia A, located 11,000 light-years away, is one of the most famous and well-studied objects in the Milky Way. It's what we call a supernova remnant – the expanding cloud of ejecta left over after a massive star has gone kaboom. This material is expanding at an average rate somewhere between 4,000 and 6,000 kilometers per second.In their new study, Vink and his colleagues studied 19 years' worth of X-ray data from the Chandra X-ray Observatory to piece together how the remnant has been changing over time.
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