Some guys buy flowers. Thad Roberts decided to steal a piece of the moon instead. In the summer of 2002, Roberts was a 25-year-old intern at NASA's Johnson Space Center in Houston, a triple major in physics, geology and geophysics who'd spent his college years founding an astronomy club and dreaming, quite literally, of becoming an astronaut. Then he met Tiffany Fowler, another NASA intern working in a stem-cell lab. Three weeks into dating her, Roberts had already moved in with her. And somewhere in that stretch, he landed on an idea that no romance novel would have dared write: he'd give her the moon. Not figuratively. Actual moon.