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CETEX hopes that the first rockets to approach the moon will merely circle around it without landing. When landings are made, they should be confined to limited areas of the moon so that the rest can be studied in the unsullied state. Looking farther ahead, CETEX urges that expeditions to Mars or Venus be extremely careful not to release living organisms. There is a reasonable chance that some forms of earthly living matter might survive and grow on either planetperhaps well enough to compete with Martian and Venusian life, if any. It would be sad to land on Mars only to find its inhabitants dead or damaged by a pestilence caused by earthly germs.