A new telescope designed to peer into the twisted X-ray Universe has just sent back its first-ever imaging data.
The Imaging X-Ray Polarimetry Explorer , a joint project between NASA and the Italian Space Agency, fixed its gaze on one of the most famous explosions in the Milky Way: Cassiopeia A.Located 11,000 light-years away, it's the expanding remnant of a star thought to have been observed exploding in the 1690s, and it's one of the most well-studied objects in the Milky Way, for good reason – it has provided some invaluable insight into supernovae.
There's a lot going on in Cassiopeia A. Before it died, the precursor star was a massive object that, as it ran out of fuel, became unstable, ejecting its outer layers to create a cloud of circumstellar material. When the supernova finally did take place, therefore, the shock wave was not entering pristine space, but a relatively dense cloud.
France Dernières Nouvelles, France Actualités
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