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Recent analysis of scientific data from Cassini and earth-based observationsgave evidence for a global ocean under a surrounding solid ice shell onSaturn's moon Enceladus. Images of Enceladus' South Pole showed severalfissures in the ice shell with plumes constantly exhausting frozen waterparticles, building up the E-Ring, one of the outer rings of Saturn. In thissouthern region of Enceladus, the ice shell is considered to be as thin as 2km, about an order of magnitude thinner than on the rest of the moon. Under theice shell, there is a global ocean consisting of liquid water. Scientists arediscussing different approaches the possibilities of taking samples of water,i.e. by melting through the ice using a melting probe. FH Aachen UAS developeda prototype of maneuverable melting probe which can navigate through the icethat has already been tested successfully in a terrestrial environment. Thismeans no atmosphere and or ambient pressure, low ice temperatures of around 100to 150 K (near the South Pole) and a very low gravity of 0.114 m/s$^2$ or 1100{\mu}g. Two of these influencing measures are about to be investigated at FHAachen UAS in 2017, low ice temperature and low ambient pressure below thetriple point of water. Low gravity cannot be easily simulated inside a largeexperiment chamber, though. Numerical simulations of the melting process atRWTH Aachen however are showing a gravity dependence of melting behavior.Considering this aspect, VIPER provides a link between large-scale experimentalsimulations at FH Aachen UAS and numerical simulations at RWTH Aachen. Toanalyze the melting process, about 90 seconds of experiment time in reducedgravity and low ambient pressure is provided by the REXUS rocket.

VIPER - Student research on extraterrestrial ice penetration technology