A

David

Darling

penetrator probe

A penetrator probe is a device that, by impact, tunneling, or melting, penetrates beneath the surface of a planet, moon, asteroid, or comet, to investigate the subsurface environment. Among missions currently under development or consideration that will deploy penetrator probes are Deep Impact and the Europa Ocean Explorer (see Europa, future probes). The failed Mars Polar Lander carried the first penetrator probes.