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Exploratour - Does Europa have an Ocean?, page 6 - Windows to the Universe

Exploratour - Does Europa have an Ocean?

This is a close-up image of the Pwyll crater taken by the Galileo spacecraft.
Click on image for full size
Image courtesy of NASA

1.) Now let's discuss some of the geologic evidence for an ocean. We will not cover all the fine details which geologists are studying, just some of the major points. The first piece of evidence comes from a look at some of the craters. Some craters in particular exhibit a multi-ringed structure which suggests that whatever hit the surface of Europa relaxed into a warm layer of slushy ice. An example of such a crater is shown in this image. This is the crater called Pwyll. This crater is reminiscent of a footprint left in a partially frozen puddle in the sidewalk on a snowy day.

This is page 6 of 20

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Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part is sponsored in part through grants from federal agencies (NASA and NOAA), and partnerships with affiliated organizations, including the American Geophysical Union, the Howard Hughes Medical Institute, the Earth System Information Partnership, the American Meteorological Society, the National Center for Science Education, and TERC. The American Geophysical Union and the American Geosciences Institute are Windows to the Universe Founding Partners. NESTA welcomes new Institutional Affiliates in support of our ongoing programs, as well as collaborations on new projects. Contact NESTA for more information. NASA ESIP NCSE HHMI AGU AGI AMS NOAA