National Geographic : 1960 Jul
than split, as in fission. This difficult tech nique, used in the H-bomb, would yield incredible power. But, as Dr. John Evvard, a Lewis scientist, pointed out: "Fusion is like a rabbit stew. Before you can enjoy the stew, you have to catch the elusive rabbit-and we're still chasing it." The fission rabbit, on the other hand, has been captive for years, but it has not yet been harnessed effectively in rockets. Their com- NASA pact reactors would have to operate at far higher temperatures than the big reactors now used to generate electricity. Here, as in space ship hull construction, we need materials more resistant to heat. The atom may not be the only key to dis tant space flight. NASA hopefully experi ments with another promising technique that makes Buck Rogers look downright Victorian. Scientists call it electric propulsion.