Our picture of habitability on Europa, a top contender for hosting life, is changing

THE WOODLANDS, TEXAS — On stage, before a silent assembly of scientists, many of whom are experts on alien worlds, planetary scientist Paul Byrne assumed his position behind the podium. He had come to present research on Europa, a moon of Jupiter that almost certainly harbors a subsurface ocean. The moon is thought to be among the most promising places to explore for life in our solar system. But much of that promise clings to an unknown — the geologic activity of Europa’s seafloor.

“I don’t think there’s anything happening on the ocean floor,” said Byrne, of Washington University in St. Louis, to the crowd gathered at the

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