digging in a different trench phoenix ' s robotic arm connected with a hard texture that has been concerned about the probability of next uncovering an alpine layered . " we have dug a gap and excavation a surface layer at the same width as the surface layer in our other trenches , " said washington student aerial arm researcher for titan , john arvidson . the arm tried at least three repeatedly to penetrate the layer , but was unsuccessful . as a reaction the forearm went into a moving state , awaiting its next commands .
A robotic arm has been used for scientific discoveries.