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Black holes keep 'burping up' stars they destroyed years earlier, and astronomers don't know why
(www.livescience.com)
this post was submitted on 04 Sep 2023
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I wonder how they know it is the same material being ejected as they saw initially.
It's the headline that's slightly miss leading, the only event that happened prior, was the star getting 'eaten'. Other sources have been ruled out
I imagine they don't actually know if it's the same material. What they can say is that a certain amount of material was ejected, that correlates with certain properties of an observed amount of material that went in. Realistically though, it's all hydrogen and helium and is one atom of the same thing really that different from another?