Abstract
Recent observations of Halley's Comet show a broad absorption band centred at 3.4 Μm and which can be explained on the basis of a bacterial grain model.
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References
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Wickramasinghe, D.T., Hoyle, F., Wickramasinghe, N.C. et al. A model of the 2–4Μm spectrum of Comet Halley. Earth Moon Planet 36, 295–299 (1986). https://doi.org/10.1007/BF00055167
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DOI: https://doi.org/10.1007/BF00055167