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Nov 6, 2019 at 2:08 comment added nijineko Since this is a thought experiment, I'm not concerned with formation, only the effects. I'm pretty sure Einstein wasn't worried about how one might accelerate his ladder to light speed. 。.:☆*:・'(⌒―⌒)))
Nov 5, 2019 at 10:41 comment added Andrew Steane Concerning formation, I suppose it may be just about possible that a large antimatter star caught a smaller matter star with planets and annihilated it, and somehow a matter planet survived the process and ended up in orbit around what remained of the antimatter star, or possibly there could be wandering lumps of matter detached from a star after a supernova and one got caught into orbit around an antimatter star (if there are any, which seems highly unlikely of course).
Nov 5, 2019 at 5:56 history answered anna v CC BY-SA 4.0