Space and astronomy news
Cost is a major driving factor in the development of space exploration missions. Any new technology or trick that could lower the cost of a mission makes it much more appealing for mission planners. Therefore, much of NASA’s research goes into those technologies that enable cheaper missions. For example, a few years ago, NASA’s Institute for Advanced Concepts supported a project by Michael VanWoerkom of ExoTerra Resource to develop a lander mission that could support a sample return from Europa.
The mission cost estimated for an SLS-launched Europa lander was around $5 billion, making it prohibitively expensive for NASA or any other agency without significant sacrifices to other missions. ExoTerra estimates that, by using several weight-reducing technologies, they could bring the mission price tag down to $500 million—a much more reasonable sum to garner support from one of the government space programs.Three different technologies would enable this weight and cost to drop.
Just how the lander can get that sample back off the icy moon is the focus of the next major technological step – the µISRU system. NIMPH’s architecture would require using the local ice as a propellant. A lander would literally sublimate the ice under its feet, suck up the resultant water vapor, electrolyze it to split it into oxygen and hydrogen, and then liquefy it to store it for use in getting a 1 kg ice core sample back into orbit.
There are some nuances to this entire mission architecture. For example, the SEP system wouldn’t work at full capacity in the Jovian system, so a much smaller LOx / Methane propulsion system is needed to maneuver the orbiter into position. Additionally, the lander would likely have to leave its legs embedded in the Europan ice, as the sublimation process it uses to collect fuel would likely embed them in place.
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