Our Dyna-Soar had been modified to some degree for this mission. It's essentially a big delta-winged glider with a squarish fuselage in the center. The mods had consisted of tying a third rocket stage out behind, so that Sid could move us around the orbit from one Telstar to the next if my work on the first one proved out. The retro-rockets had several times their normal complement of fuel, so that he could stop after he got started. The same was true of our steering jets. The ship was not pressurized on the lift off. Cabin pressure fell rather quickly, as we could feel from the inflation of our suits, to their three and a half-pound pressure. No bends for either of us, because of the helium substitution for nitrogen. Because there were two of us, we could chuck and unchuck airtanks for each other as we needed fresh supplies. We had enough air and water for forty-eight hours. Together with our low-residue diet for the final week, they figured we could sweat it out in our suits for two days. We had suit radios, of course, and could talk with each other for a distance of a mile or so. Burnout of the second stage came suddenly, and we heaved slightly against our belts as the springs in our seats pushed back out. And then I got my first taste of free fall. Each veteran astronaut I had talked to at the Cape had a different way of trying to scare me with the idea of falling endlessly, and each had different ideas about how to lick it. In spite of all the talk, I grabbed the arms of my seat to keep from falling. I turned my head and in the glow from our instruments could see Sid sneering across at me through his transparent bubble helmet. "How you like them apples?" his voice came from my earphone. "That first step is a killer, Sid," I said, trying to sound chipper. I felt horrible. "Let me know when you've had enough," he suggested. "I've got things to do." I knew he did. We had dry-run it a hundred times. If we had been inserted correctly in orbit, the _Nelly Bly_ was right in the path that three of the Telstars were now following, and catching up with Number One at several hundred miles an hour. On the ground, radars all around the world were taking fixes on us, and Sid was talking shop over his long-range radio with the radar crews. By the time my stomach had made up its mind that it would stick with me, he had a report. "It could be worse," he said. "We've got a lot more velocity than I'd like, but we're on course. Our orbit would differ quite some, Seaman. Because of this speed we'd be somewhat more eccentric--maybe swing out a hundred miles beyond the birds we're chasing. Are you making it?" "Easy, Sid. Do we slow down yet?" "I'll fire the retros and retard us to the speed of what we're chasing," he said. "That will equalize our orbits very nearly. Get busy on that scope if you're up to it. I'll compute my retro." * * * * *