Word: orbiter
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...enthusiasts estimate that a single advanced Saturn booster will be powerful enough to make the voyage direct, skipping the costly and difficult rendezvous in earth orbit...
...plans to land on the moon are necessarily uncertain. No manned satellite has yet approached another orbiting object, or even attempted to. The formidable problems of bringing two manned satellites together and making them join without damage are still far from solution, and new, unimagined difficulties are sure to arise before a dependable technique has been developed and tested. Plenty of space experts fear that many years will pass before the first successful rendezvous on earth orbit has been accomplished...
Rendezvous on a lunar orbit promises to be even more difficult...
...Their Own. Astronauts trying to rendezvous on a lunar orbit will be on their own. There will be no friendly stations on the moon's hostile surface, no computers to analyze the orbits of the waiting spaceship or of the bug that is trying to join it. Unless the two are close together, their crews will not be able to see each other or communicate by radio; the moon's surface curves so sharply that a few hundred miles of distance will put each of them below the other's horizon. Theoretically they can communicate by relaying...
Before attempting lunar orbital rendezvous, U.S. astronauts will have to make many practice steps. First will come rendezvous in earth orbit, the crewmen becoming proficient at bringing their satellite capsules together with help from the earth below. Then a spaceship will voyage to the moon, park itself for a while in orbit there and return to the earth. After that, a bug will leave the spaceship and make a practice rendezvous with it without trying to land. Only after this maneuver has been mastered by several successful trials will the first lonely bug attempt to land on the hostile moon...