Science: Return to Mars

Although the U.S. Skylab space station has overshadowed recent Russian manned space ventures, the Soviet Union is pressing ahead as strongly as ever in unmanned exploration of the cosmos. Last week the Russians took advantage of the current favorable position of the earth and Mars—an alignment that occurs only once every two years—to launch two more unmanned spacecraft toward the Red Planet. Dubbed Mars 4 and 5, the ships should reach the vicinity of the earth's nearest planetary neighbor, now some 42 million miles away, in about six months.

As usual, the Russians...

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