The United States government is given a warning by the pre-eminent biophysicists in the country: current sterilization procedures applied to returning space probes May be inadequate to guarantee uncontaminated re-entry t...The United States government is given a warning by the pre-eminent biophysicists in the country: current sterilization procedures applied to returning space probes May be inadequate to guarantee uncontaminated re-entry to the atmosphere. Two years later, seventeen satellites are sent into the outer fringes of space to collect organisms and dust for study.