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Significance of absorption features in Io's IR reflectance spectrum

Absorption features in Io's reflectance spectrum suggest that frozen SO2 molecules are present on the surface of Io as free frost; this may have important implications for Io's atmosphere.

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Fanale, F., Brown, R., Cruikshank, D. et al. Significance of absorption features in Io's IR reflectance spectrum. Nature 280, 761–763 (1979). https://doi.org/10.1038/280761a0

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