Liquid water and active resurfacing on Europa (original) (raw)

Nature volume 301, pages 225–226 (1983)Cite this article

Abstract

Voyager images of the jovian moon Europa show a bright icy surface transected by a complex pattern of long, linear fracture-like markings with a slightly lower albedo1. Very few impact craters are observed, with sizes generally hi the range 10–20 km. Indicators of surface composition and texture include deep IR H2O absorption features2, UV absorption features characteristic of sulphur in a water matrix on the trailing hemisphere3, and a photometric function indicating much more homogeneous scattering than areas of equal albedo on Ganymede and Callisto4. Europe's mean density is 3.03 g cm−3, indicating a primarily silicate composition. However, if the density of the silicates is the same as for Io, the H2O mass fraction would be ∼6%, enough to form an outer layer of H2O > 100 km thick if completely differentiated. Several models have been suggested for the evolution and present state of Europa5–8. We present here arguments for recent resurfacing by H2O from a liquid layer, based on new interpretations of recent spacecraft and Earth-based observations and revised theoretical calculations.

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References

  1. Smith, B. A. Science 206, 927–950 (1979).
    Article ADS CAS Google Scholar
  2. Pilcher, C. B., Ridgway, T. B. & McCord, T. B. Science 178, 1087–1089 (1972).
    Article ADS CAS Google Scholar
  3. Lane, A. L., Nelson, R. M. & Matson, D. L. Nature 292, 38–39 (1981).
    Article ADS CAS Google Scholar
  4. Buratti, B. & Veverka, J. Icarus (submitted).
  5. Consolmagno, G. J. & Lewis, J. S. in Jupiter (ed. Gehreis, T.) (University of Arizona Press, Tucson, 1976).
    Google Scholar
  6. Cassen, P. M., Reynolds, R. T. & Peale, S. J. Geophys. Res. Lett. 6, 731–734 (1979).
    Article ADS Google Scholar
  7. Cassen, P. M., Peale, S. J. & Reynolds, R. T. Geophys. Res. Lett. 7, 987–988 (1980).
    Article ADS Google Scholar
  8. Ransford, G. A., Finnerty, A. A. & Collerson, K. D. Nature 289, 21–24 (1981).
    Article ADS CAS Google Scholar
  9. Cassen, P. M., Peale, S. J. & Reynolds, R. T. in The Satellites of Jupiter (ed. Morrison, D.) (University of Arizona Press, Tucson, 1982).
    Google Scholar
  10. Yoder, C. F. Phil. Trans. R. Soc. Lond. 303, 327–338 (1981).
    Article ADS Google Scholar
  11. Cappallo, R. J., Counselman, C. C., King, R. W. & Shapiro, I. I. J. geophys. Res. 86, 7180–7184 (1981).
    Article ADS Google Scholar
  12. Matson, D. L., Ransford, G. A. & Johnson, T. V. J. geophys. Res. 86, 1664–1672 (1980).
    Article ADS Google Scholar
  13. Sinton, W. M. J. geophys. Res. 86, 3122–3128 (1980).
    Article ADS Google Scholar
  14. Morrison, D. & Telesco, C. in The Satellites of Jupiter (ed. Morrison, D.) (University of Arizona Press, Tucson, 1982).
    Google Scholar
  15. Bullen, K. E. The Earth's Density (Halsted, New York, 1981).
    Google Scholar
  16. Proctor, T. M. J. accoust. Soc. Am. 39, 972–977 (1966).
    Article ADS CAS Google Scholar
  17. Rayleigh, C. B. & Paterson, M. S. J. geophys. Res. 70, 3965–3985 (1965).
    Article ADS Google Scholar
  18. Reynolds, R. T. & Cassen, P. M. Geophys. Res. Lett. 6, 121–124 (1979).
    Article ADS CAS Google Scholar
  19. Weertman, J. in Physics and Chemistry of Ice (eds Whalley, E., Jones, S. J. & Gold, L. W.) (Royal Society of Canada, 1973).
    Google Scholar
  20. Passey, Q. R. & Shoemaker, E. M. J. geophys. Res. (submitted).
  21. Shoemaker, E. M. & Wolfe, R. F. in The Satellites of Jupiter (ed. Morrison, D.) (University of Arizona Press, Tucson, 1982).
    Google Scholar
  22. Parmentier, E. M. & Head, J. W. Icarus 47, 100–111 (1981).
    Article ADS Google Scholar
  23. Eviatar, A., Siscoe, G. L., Johnson, T. V. & Matson, D.L. Icarus 47, 75–83 (1981).
    Article ADS CAS Google Scholar
  24. Lanzerotti, L. J., Brown, W. L., Johnson, R. E. & Armstrong, T. P. Astrophys. J. 259, 920–929 (1982).
    Article ADS CAS Google Scholar
  25. Fanale, F. P., Johnson, T. V. & Matson, D. L. in Planetary Satellites (ed. Burns, J. A.) (University of Arizona Press, Tucson, 1977).
    Google Scholar
  26. Helfenstein, P. & Parmentier, E. M. Lunar planet. Sci. Conf. XI, 1987–1998 (1980).
    ADS Google Scholar

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Authors and Affiliations

  1. NASA Ames Research Center, Moffett Field, California, 94035, USA
    Steven W. Squyres, Ray T. Reynolds & Patrick M. Cassen
  2. Department of Physics, University of California, Santa Barbara, California, 93106, USA
    Stanton J. Peale

Authors

  1. Steven W. Squyres
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  2. Ray T. Reynolds
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  3. Patrick M. Cassen
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  4. Stanton J. Peale
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Squyres, S., Reynolds, R., Cassen, P. et al. Liquid water and active resurfacing on Europa.Nature 301, 225–226 (1983). https://doi.org/10.1038/301225a0

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