A team led by William Sparks of the Space Telescope Science Institute in Baltimore used Hubble to hunt for Europa plumeson 10 separate occasions over a 15-month span. They had success three times, spotting apparent plume activity in January, March and April of 2014.
"They appear to be real," Sparks said during a news conference today. "The statistical significance is pretty good, and I don’t know of any other natural alternative."
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