Download PDF by G. A. Soffen (auth.), George Marx (eds.): Bioastronomy — The Next Steps: Proceedings of the 99th

By G. A. Soffen (auth.), George Marx (eds.)

ISBN-10: 9400929595

ISBN-13: 9789400929593

ISBN-10: 9401078300

ISBN-13: 9789401078306

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Read or Download Bioastronomy — The Next Steps: Proceedings of the 99th Colloquium of the International Astronomical Union held in Balaton, Hungary, June 22-27, 1987 PDF

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Extra info for Bioastronomy — The Next Steps: Proceedings of the 99th Colloquium of the International Astronomical Union held in Balaton, Hungary, June 22-27, 1987

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25 If an ocean does exist, through-going fractures could occur in the thin ice layer covering it. This possibility is certainly supported by the appearance of the features on Europa's surfaces. Fracturing could be caused by tidal stresses or from movement of the shell with respect to the tidal bulge of Europa. Liquid water exposed to the surface by fracturing would rapidly boil, creating a cloud of vapor that would condense over the surface of the satellite. If the surface conductivity was reduced below that of solid ice by the presence of an insulating layer such as porous frost, the equilibrium thickness of the ice shell could be greatly reduced.

There were also particles out of these classes. Their spectra need further investigations. In three cases the analyses can not exclude the presence of pure ice particles. 11. , Astron. , to be publ ished 1987). 11. 99,1982. , Icarus 64, 51, 1986. , The Astrophys. J. 278, 449, 1984. , 5, 233, 1985. 11. 269, 1986. II. 255, 1986. 1. 397, 1986. , Nature 321, 320, 1986. , Catalog. of comet. orbits, Cambridge, 1982. , 10, 1, 1985. , Icarus 54, 388, 1983. , private comm. , ESA SP-249, 149, 1986. , Adv.

I confine myself only to PUMA results based on two papers of Sagdeev et al. (1897d and 1987e). The PUMA experiment was a difficult one. It measured the atomic components of dust particles by evaporating them on impact on a silver target. e. about 80 km/s. As such high velocity is unattainable in laboratory the device can not be calibrated on ground. The impact evaporation procedure, the formation of a plasma cloud on impact is also not fully understood theoretically. So in this case the data reduction is a very tedious job; the newly published results differs from qUick-look data and will be enriched in future.

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Bioastronomy — The Next Steps: Proceedings of the 99th Colloquium of the International Astronomical Union held in Balaton, Hungary, June 22-27, 1987 by G. A. Soffen (auth.), George Marx (eds.)


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