Would we be able to tell if an entire neighboring galaxy was made up of anti-matter? What would we see in its signals? It seems like the anti-matter could be stable if it was completely surrounded by other anti-matter.
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5$\begingroup$ Possible duplicate of Experimental observation of matter/antimatter in the universe and How would we tell antimatter galaxies apart? $\endgroup$– BMSCommented Sep 9, 2014 at 19:38
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