NASA announced the selection of nine instruments it plans to fly on a mission to Jupiter’s moon Europa May 26, but agency officials were vague about whether the instruments, or the overall mission, could meet an aggressive schedule sought by some in Congress.

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Jeff Foust has more than a decade of experience writing about space policy, entrepreneurial ventures and regulatory affairs. In 2001, he established spacetoday.net to aggregate and summarize the day's space-related news stories. In 2003, he started The...