"I'm used to traveling the universe solo." At least he was now; Mjölnir had been fine company -- like traveling around with a friend from back home. But Mjölnir wasn't a person and it wasn't even intact anymore -- its crumbled pieces had been left behind on the cliff in Norway.

Traveling the universe was what he was going to do. He had to find Thanos, and though Tony might insist on going there, if they survived -- and if his people didn't make it to Earth, he'd have to find them and bring them there.

And the universe was a tremendously large place.

"I knew what I was signing up, too, you know," he says. Tony perhaps didn't; even if he knew Thor was keeping secrets, he probably didn't imagine it was something like this.