Strange double ridges on the surface of Jupiter's ice moon Europa could be signposts to shallow reservoirs of water.
We don't, however, know much about the moon. For example, its surface is scored with enormous double ridges, which run along either side of long troughs. How these form has been a mystery since they were first discovered in images taken by the Galileo probe in the 1990s.As is so often the case in science, happenstance may have given us an answer.
"People have been studying these double ridges for over 20 years now, but this is the first time we were actually able to watch something similar on Earth and see nature work out its magic,""We are making a much bigger step into the direction of understanding what processes actually dominate the physics and the dynamics of Europa's ice shell."
These data revealed that the ridges in Greenland formed when a pocket of pressurized water refreezing inside the ice sheet caused the ice sheet to fracture. This produced the double-peaked M shaped-feature in the ice – and it's eminently possible that similar processes have been taking place on Europa, the team said.
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