In the 13 years since Russia launched Sputnik 1, man has steadily pushed back the frontiers of space. Astronauts have walked on the moon, the Soviet spacecraft Venera 7 has soft-landed on Venus, and three U.S. Mariner spacecraft have swept past Mars, transmitting detailed pictures back to earth. Now scientists are preparing for an even more far-reaching journey. Last week NASA discussed its plans to launch the first unmanned planetary probe to the outer part of the solar system—a 550-lb. spacecraft that will fly past Jupiter.
To reach the solar system's largest planet, a...
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