"So it's definitely... It's a world thing. A dimensions thing. Not a... time. Thing." Steve nods, still not looking at her. "I think the person you need to talk to would probably be Dr. Jane Foster. She's the brain behind the Foster Theory - um, the bridge between worlds, the thing Thor calls the Bifrost. It links Earth to the nine planets- something like that. I'm not really good with the science myself."

Deep breath. "As for why here, I don't know, I'm afraid. I mean - we're not strangers to any of the things you're talking about. But why here, specifically? When you don't have any clear reason for it?"

He spreads his hands, looking apologetic. "You'd be better off asking Dr. Foster."