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"description": "See the following sources:\n\n* [http://hubblesite.org/newscenter/archive/releases/2016/33/](http://hubblesite.org/newscenter/archive/releases/2016/33/)\n* [http://www.nasa.gov/europa-activity](http://www.nasa.gov/europa-activity)\n* [http://iopscience.iop.org/article/10.3847/0004-637X/829/2/121/meta](http://iopscience.iop.org/article/10.3847/0004-637X/829/2/121/meta)",
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