Science: To Keep the Moon Virgin

Next week the U.S. will try to send a rocket around the moon. At the same time or soon after, the Russians may be tempted to outdo the U.S. by hitting the moon with a big rocket. Last week scientists of the International Council of Scientific Unions met in Washington to plead with both to make haste with due care.

To scientists, the crucial point is this: in all the world, there is nothing like the moon. It is, in effect, a superbly preserved relic of the early days of the solar system, sealed off...