"Mars, maybe." Senku chuckled. "There was speculation that a person could go there, but hard to say really. I'd have to build a lot to get to that point."

Then again, never say never. "Ah, we didn't have that." He shook his head. "We did have the International Space Station. It was used mostly for space experiments. My dad was there when the whole thing happened. It was like a base up in space, but not like a city. Way more cramped than that."