X-ray polarization evidence for a 200-year-old flare of Sgr A* - Nature
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A study reports the measurement of the polarization degree and angle of X-rays from Sagittarius A* reflected off a nearby cloud, indicating an X-ray flare about 200 years ago.

cross-posted from: https://lemmy.sdf.org/post/659261

Well, from the perspective of Earth. Obviously there’s a big delay on the way here, which is kind of the entire idea of the technique used.

Plus, without reading the paper I’m not sure what “briefly” means. Even if it was a short spurt this is crazy, though.