Science: Journey to Jupiter

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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