I had logged more than 9,000 hours of flying time, including as a test pilot and a zero-G pilot, so I had some experience. I’d even been up to 80,000 feet, where I could begin to see the blue shell of the atmosphere. But there are some things you can just never prepare for. The noise of the rocket on liftoff was unbearably loud—they gave me and the other five crew members earplugs to dampen the noise. And I had assumed that as we left the atmosphere, there would be a gradual separation from light to the darkness of space. But there isn’t. It’s a sharp border. It seemed like a dark curtain had fallen over the large windows we were sitting next to.