Ronan hasn't told her, either because Hennessy formulates her questions to be as annoying as possible on purpose, or because she's been trying hard to feign disinterest in the hopes of teasing out some unsolicited information. In either case, the matter of him being from outer space hasn't entered the discussion until this instant.

"Are you from the future? Does humanity actually get its shit together and go ruin other planets as badly as we're ruining Earth? Are there finally the stupid flying cars???"

She sounds almost thrilled by the prospect. What a relief, honestly, to learn that the fate of Earth is nearly irrelevant, at least in one corner of the multiverse.