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NASA Selects PRAXIS Mission Concept for NIAC 2026 Phase I Funding
NASA selects the PRAXIS (Planetary Rings Autonomous EXploration with In-situ Sampling) mission concept for NIAC 2026 Phase I funding. The concept provides for in-situ sampling by touching, collecting, and analysing ring particles around ringed planets such as Saturn, Uranus, and Neptune.
PRAXIS Mission Concept (NIAC 2026 Phase I):
| Dimension | Key Details |
|---|---|
| Full form | PRAXIS comprises Planetary Rings Autonomous EXploration with In-situ Sampling. |
| Programme and phase | NASA provides for PRAXIS under NIAC 2026 Phase I funding. |
| Mission capability | PRAXIS provides for directly touching, collecting, and analysing physical samples from ring particles ranging from millimeter to centimetre scale. |
| Target bodies | The sampling system is designed to explore dense ring systems (Saturn), faint or tenuous rings (Uranus and Neptune), and ringed Centaurs such as Chariklo and Chiron. |
| Barrier to direct penetration | Planetary rings comprise millions of fast-moving particles ranging from microscopic dust to house-sized boulders, made largely of water ice mixed with rocky material, and direct flight through the dense ring plane creates collision hazards that could instantly destroy a probe. |
| Technology approach | Rather than penetrating the ring structure, PRAXIS relies on autonomous robotics and AI to graze the ring plane. |
| Post-Cassini gap cited | While the Cassini mission provides for close-range photography, it does not directly capture or analyse real ring particles in-situ, and PRAXIS provides for bridging this gap. |
| NIAC Phase I provision | Phase I selection authorises the development team to run computer simulations and refine system designs. |
| NIAC Phase II provision | Advancing to Phase II authorises the creation of physical prototypes. |