NASA backs concepts for deep-drilling Mars rover and interstellar-object probe

An illustration shows the deployment of an autonomous borebot into a layered deposit on Mars. The inset shows a closeup of the borebot drive system. (Planet Enterprises Illustration / James Vaughan)
The latest crop of NASA-backed concepts for far-out space exploration includes “borebots” that could drill as far as a mile beneath the Martian surface in search of liquid water,

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