Wetterballon hoch, "klebriges Fliegenpapier" raushängen zwischen 22 und 27 Kilometern Höhe, Fliegenpapier wieder reinholen, versiegeln, runterkommen, Fliegenpapier unter's Elektronenmikroskop legen und das sehen:

Und dann daraus diese Schlüsse ziehen:

Details of stratosphere-isolated biomorphs are given, including a fragment of a diatom frustule and an inorganic particle-rich mass containing biological filaments. We argue that this mass which is around 300 micron in size is, like the other biological entities shown, too large to have been carried from Earth to the stratosphere. As a result, we conclude that the biological entities arrived from space, probably from comets, and their existence in the stratosphere provides prima facie evidence in support of the Hoyle-Wickramasinghe theory of cometary panspermia.