Astrophysics and Space Science

, Volume 66, Issue 1, pp 77–90 | Cite as

On the nature of interstellar grains

  • F. Hoyle
  • C. Wickramasinghe


Data on interstellar extinction are interpreted to imply an identification of interstellar grains with naturally freeze-dried bacteria and algae. The total mass of such bacterial and algal cells in the galaxy is enormous, ∼1040 g. The identification is based on Mie scattering calculations for an experimentally determined size distribution of bacteria. Agreement between our model calculations and astronomical data is remarkably precise over the wavelength intervals µ−1 < ;−2 < 1.94µ−1 and 2.5µ−1 < ;−1 < 3.0 ;−1. Over the more restricted waveband 4000–5000 Å an excess interstellar absorption is found which is in uncannily close agreement with the absorption properties of phytoplankton pigments. The strongest of the diffuse interstellar bands are provisionally assingned to carotenoid-chlorophyll pigment complexes such as exist in algae and pigmented bacteria. The λ2200 Å interstellar absorption feature could be due to ‘degraded’ cellulose strands which form spherical graphitic particles, but could equally well be due to protein-lipid-nucleic acid complexes in bacteria and viruses. Interstellar extinction at wavelengths λ<1800 Å could be due to scattering by virus particles.


Cellulose Phytoplankton Virus Particle Algal Cell Absorption Property 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© D. Reidel Publishing Co 1979

Authors and Affiliations

  • F. Hoyle
    • 1
  • C. Wickramasinghe
    • 1
  1. 1.Dept of Applied Mathematics and AstronomyUniversity CollegeCardiffWales

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