Life in Ice: Informing the Search on Other Ocean Worlds

Presenter: Jody Deming, University of Washington
When: May 17, 2016 3PM PDT

When ice forms on Earth, a liquid phase exists within the ice at temperatures warmer than –55°C if the source fluid is impure. Impurities invariably exist and include both inorganic chemical substances and biological materials, particularly microorganisms, viruses and their organic releases. If the source waters are salty, then the liquid volume fraction of the ice is greater: the temperature-dependent fraction of brine volume in sea ice ranges from ~0.0001 to ~0.2; in glacial ice it rarely exceeds 0.0001; in vitrified glass, it is effectively zero. The extent of the liquid fraction in an ice formation, regardless of source waters or freezing pathway, determines whether the encased organisms are preserved, metabolically active, or reproducing and evolving, assuming other organismal needs and tolerances are also met. Such knowledge from terrestrial studies can inform the search for life on ice-covered moons – in the ice itself and in oceans below an icy crust. Of particular interest is the recovery of microbes that have been preserved in ice, which is a possible scenario to consider for future space missions.

To join using a videoconferencing system:

Please RSVP to Mike Toillion ( if you will be joining by Polycom.

To view the slides, connect to

To join using a web browser:

The slides and audio/video for this meeting will be presented using Adobe Connect. To join the meeting, connect to:

If you are having problems connecting, you can try joining, or rebooting your computer, or try joining from another network.

University of Washington Seminars

  • The University of Washington seminar series is hosted by the NAI Virtual Planetary Lab (VPL) team live from the University of Washington campus in Seattle.
  • Subscribe to this series

Other Seminars in this Series