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The grandeur of mankindโ€™s ambitious plans of space travel and settlement has us reaching for the outer planets. A month ago, the White House earmarked over $17.7 billion for unmanned space missions that might answer the existential question about life beyond Earth. This comes two years after the U.S. National Research Councilโ€™s Planetary Science Decadal Review put out its 10-year recommendation for NASAโ€™s planetary exploration program. The report had ranked exploration of Jupiterโ€™s icy Moon Europa as the highest-priority mission. From...