Quote:
Originally Posted by Vaevictis Asmadi
I'm liking the "colliding binary neutron stars" idea.
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The issue there is that those are already supernova remnants. Unless very ancient the supernova that produced the neutron stars would leave a bubble of hot gas the way the Geminga supernova did. I haven't heard of a detectable bubble besides the Geminga one in our neighborhood.
<shrug>It's more possible and I can't rule it out but it still requires some extremely improbable events.