With its selection of four candidates for its coveted Discovery class of interplanetary missions, the space agency seeks to handle some unfinished business
Amid technical and political hurdles, a veteran planetary scientist takes charge of a key part of Europa Clipper, a spacecraft targeted at the solar system’s most intriguing moon
NASA’s first sample-return mission to an asteroid is a voyage into the genesis of our solar system—and, perhaps, the precursors to life’s origins on Earth
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