NASA Selects Futuristic PRAXIS Mission to Explore Planetary Rings

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**NASA** has selected a futuristic spacecraft concept named **PRAXIS** for its **NIAC 2026 Phase I** funding.
The abbreviation **NIAC** stands for **NASA Innovative Advanced Concepts** program.
The concept was developed at **NASA’s Jet Propulsion Laboratory (JPL)** under the leadership of **Dr. B. Marco Quadrelli**.
**PRAXIS** stands for **Planetary Rings Autonomous EXploration with In-situ Sampling**.
It aims to become the very first space mission to directly touch and collect samples from planetary ring systems in deep space.

Humanity has never directly touched or collected physical samples from any planetary ring in our solar system.
While **NASA's Cassini mission** provided groundbreaking images and data about **Saturn**, fundamental questions about ring formation remain unanswered.
Scientists still do not fully understand how ring systems originate, evolve over time, and eventually disappear.
Rings around planets like **Saturn**, **Uranus**, and **Neptune**, as well as smaller bodies like **Chariklo** and **Chiron**, consist mainly of water ice.
Particle sizes in **Saturn's** rings range from microscopic dust grains to house-sized boulders that constantly collide and break apart.
Earlier missions lacked the technology to observe millimeter- to centimeter-sized particles at close range, creating a critical gap in planetary science.

The spacecraft uses a non-destructive ring-grazing flight path, hovering safely outside the ring plane to avoid dangerous high-velocity debris.
It deploys a long, flexible robotic boom to perform touch-and-go operations, tapping target particles and snagging free-floating material safely.
An onboard **AI** system handles autonomous navigation, real-time collision avoidance, and target selection without waiting for commands from Earth.
Miniaturized onboard instruments will conduct immediate in-situ analysis of particle size, porosity, structure, and chemical composition.
After sampling one area, the spacecraft can move to another gap or section to compare particles across different ring environments.

The primary goal is to address high-priority research questions highlighted in the **Planetary Science Decadal Survey**.
By studying millimeter- to centimeter-scale particles, scientists hope to unravel the exact origin and dynamic evolution of planetary rings.
Data gathered by **PRAXIS** will explain complex ring features such as density waves, gaps, propellers, and self-gravity wakes.
The mission will successfully bridge the observational gap between microscopic dust and massive boulders in ring systems.

During **Phase I** in **2026**, the research team will focus on computer simulations, feasibility studies, and detailed system design.
If selected for **Phase II**, the team will construct physical prototypes and conduct laboratory tests to demonstrate technical feasibility.
Successful development during these initial phases will pave the way for eventual deployment in future deep-space exploration missions to outer planets.