Abstract
SOLID grains in space are likely to be highly porous in character. Data from meteorites1, micro-meteoritic trajectories2, as well as from comets3 provide indirect evidence that Solar-System grains are porous and a similar porosity is to be expected for interstellar grains. This would have important consequences for interstellar molecular hydrogen formation, and for the expected densities of noble gases in meteorites.
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ABADI, H., JOSHI, P., RAMADURAI, S. et al. Effects of physical adsorption on porous interstellar grains. Nature 263, 214–215 (1976). https://doi.org/10.1038/263214a0
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DOI: https://doi.org/10.1038/263214a0
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