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That piccie has nothing to do with the topic of the article. That pic's to do with gravitational lensing. The article has to do with a star that ventured a little too close to the supermassive BH at the centre of its home galaxy. That flash of light they detected was from matter being heated to multi-millions of degrees within the accretion disk around the hole. More precisely, the hotspot generated at the point where the star matter was being initially drawn into the accretion disk.
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