12/19/2023 0 Comments Fall gifThe entry rate of atmospheric probes is set by the speed required to orbit them – about 24 km/s velocity in the case of Uranus and Neptune. “To begin designing such a system we need first to adapt current European testing facilities in order to reproduce the atmospheric compositions and velocities involved.” “The challenge is that any probe would be subject to high pressures and temperatures, and therefore would require a high-performance thermal protection system to endure its atmospheric entry for a useful amount of time,” explains Louis Walpot, ESA aerothermodynamics engineer. While superficially similar to Jupiter and Saturn, with their hydrogen and helium atmospheres, Uranus and Neptune also contain sizeable heavier elements in the form of ‘supercritical’ liquid oceans deep below the surface clouds, which account for much of both planets’ masses.īoth worlds also have methane in their atmospheres – accounting for their blue appearance – although less in the case of Neptune, where it is concentrated lower in the atmosphere, so becomes less of a factor in modelling any probe flight.Īs part of any future mission to one or both worlds, an atmospheric probe resembling the one flown by NASA’s Galileo mission to Jupiter is high on scientific wish lists. Now both NASA and ESA are considering future missions to this intriguing pair, almost identical in size. Whether by impacts, landings or atmospheric probes, human-made spacecraft have touched all the planets of the Solar System except two: the outer gas giants Uranus and Neptune. Testing took place inside the hypersonic plasma T6 Stalker Tunnel at Oxford University in the UK, along with the University of Stuttgart’s High Enthalpy Flow Diagnostics Group’s plasma wind tunnels in Germany, as shown in the video clip here. Taking place as part of an effort to simulate the flight of proposed atmospheric probes, the test campaign achieved an equivalent speed up to 19 km/s – although further work will be needed to reach the actual velocities that probes into these gas giants would attain. The unique atmospheric compositions of ‘ice giant’ planets Uranus and Neptune were recreated to simulate a plunge deep within them, using suitably adapted European shocktubes and plasma facilities.
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