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Clumps of stratospheric material with individual diameters of 10-30 micrometers were isolated in a sterile manner from a height of 41 km. The masses showed no obvious morphology, but stained positive for DNA and are therefore considered to be unequivocally biological. We suggest that the masses are arriving to the stratosphere from space and not upcoming from Earth; evidence is provided to support this view.

Masses Staining Positive for DNA-Isolated from the Stratosphere at a Height of 41 km