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Nature 389, 125-126 (11 September 1997) | doi:10.1038/38123

Solar System:  Pipelines to the planets

Donald M. Hunten1

Water vapour is scarce in planetary stratospheres because it freezes out at the cold tropopause, which marks the lower boundary of the stratosphere. In spite of this, there have been some hints of water in the stratospheres of Jupiter, Titan and Uranus, and now we have direct measurements of its presence on Saturn, Uranus and Neptune, from the Short Wavelength Spectrometer on the Infrared Space Observatory (ISO).

  1. Donald M. Hunten is in the Department of Planetary Sciences and the Lunar and Planetary Laboratory, The University of Arizona, Tucson, Arizona 85721, USA.