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Icy Europa Does Battle With Solar System's Most Hellish Moon

The astronomical juxtaposition couldn't be any more stark: in the series of observations above, Jupiter's icy moon Europa passes in front of Io, fellow Jovian moon, but also the most volcanically active place in the entire solar system.

Published On 05/01/2015
1:00 PM EDT
The LBT image of Loki Patera (orange) laid over a Voyager image of the volcanic depression. The emission (in orange color) appears spread out in the north-south direction due to the telescope point-spread function; it is mainly localized to the southern corners of the lake. | LBTO- NASA