Autumn wiped the sweat from her forehead and looked up at the coaster. She wasn’t sure whether she was sweating because of the heat or the fact that this roller coaster went up far above the level of the clouds. At least, that’s what it looked like. By the time they got to the top, they’d probably need oxygen tanks. But at least she’d be able to see the Earth from orbit. And then they’d come crashing down at a few hundred thousand miles an hour.

When she was younger, ...