I don't know how canonical it is, but... in the Uz:TToG writeup of Subere, one of the possible "Secrets of the Darkness" it lists is the power to open gateways to non-Gloranthan worlds and bring monsters through. Perhaps the astronauth was summoned that way (for obscure, heartless, Subere reasons). And if "void gateways" is a power of the primal Darkness, it wouldn't surprise me if it's also a power of the even more primal Chaos...
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