While the origin of the red rain cells remains uncertain, the possibility of their astronomical relevance has been suggested in several papers (Louis and Kumar, 2003, 2006). In this connection, the hyperthermophile properties discussed in the present paper and the unusual fluorescence behaviour are worthy of note.
We conclude this section by comparing spectra in Fig 7 with astronomical spectra of a fluorescnence phenomenon (ERE emission) for which no convincing abiotic model is still available, Fig 9 shows normalised ERE emission in several astronomical objects and Fig 10 shows the same emission in the famous Red Rectangle, a nebulosity associated with a planetary nebula (Witt and Boronson, 1990; Furton and Witt, 1992, Perrin et al, 1995, Hoyle and Wickramsinghe, 1996). Although non-biological PAH explanations are still being attempted their success has so far been minimal.
These folk think they found extraterrestrial life in a red rain that fell over Kerala, possibly propagated from a comet impact.
Imagine if we discovered alien life in India, and no one noticed for a decade or so…