It's currently not known whether antimatter reacts to gravity in the same way as 'conventional' matter.
Several experiments - both cosmological and laboratory based - have attempted to determine if antimatter is attracted by or repulsed by gravity. And also whether large accumulations of antimatter would create a gravitational field as matter does.
So far, the results are unclear - though the majority of cosmologist assume that antimatter gravitationally behaves in the same way as matter.
See : Wikipedia
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