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Home NASA

Proposed NASA radio probe may use gravity ‘lumpiness’ to disclose the insides of alien worlds

June 13, 2025
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Proposed NASA radio probe may use gravity ‘lumpiness’ to disclose the insides of alien worlds
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Engineers have designed a compact, battery-powered radio probe that would assist unlock the secrets and techniques of alien planets.

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The proposed small probe, generally known as the Gravity Imaging Radio Observer (GIRO), would use gravity fields to exactly map the interiors and compositions of exoplanets and different celestial our bodies.

“GIRO is a small radio probe that displays radio indicators despatched from the host spacecraft that carried and launched it,” Ryan Park, principal engineer at NASA and supervisor of the Photo voltaic System Dynamics group on the Jet Propulsion Laboratory, advised House.com in an e-mail.


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Park and his colleagues have designed GIRO to measure refined variations within the gravitational fields of planets, moons and asteroids. They described the idea for the brand new probe in a paper printed Might 29 in The Planetary Science Journal.

“Because the probe and the host spacecraft orbit (or fly by) a goal physique collectively in formation, variations, or ‘lumpiness,’ within the physique’s gravity discipline trigger very small adjustments within the orbits of each the probe and the host spacecraft,” Park mentioned. “These adjustments might be measured utilizing the Doppler impact within the radio indicators.”

By analyzing these Doppler signatures and mapping these gravity fields with excessive precision, researchers can infer the inner construction and dynamics of planets, moons and different celestial our bodies. This perception helps reply elementary questions on their mass, density, composition, formation historical past, and potential for geologic or volcanic exercise — making GIRO a robust, high-precision software for future area exploration missions.

six different multi-colored orbs on a black background

An artist’s idea of a planetary lineup, that includes 5 exoplanets that could be much like Earth: (L to R) Kepler-22b, Kepler-69c, Kepler-452b, Kepler-62f and Kepler-186f, with Earth on the far proper. With extra superior probes, scientists might be able to study extra about alien worlds like these. (Picture credit score: NASA/Ames/JPL-Caltech)

“GIRO can be notably helpful — and even important — for issues that require the restoration of high-accuracy gravity fields, exploration of dangerous environments, and/or conditions with restricted knowledge acquisition alternatives,” Park mentioned.

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Excessive-accuracy gravity knowledge is essential in conditions the place the gravitational sign is faint, corresponding to figuring out the mass of a small asteroid or detecting adjustments within the gravity discipline of a planetary moon over time.

“Dangerous environments consult with locations the place it’s virtually difficult to conduct flybys or orbits,” Park defined. instance is the complicated and probably harmful surroundings posed by the rings of Uranus. “Restricted knowledge acquisition applies to instances the place solely a handful of flybys or a brief interval of orbiting are possible,” he added.

The battery-powered, spin-stabilized probe’s excessive accuracy, low price and skill to hold a number of probes directly may assist remedy these difficult issues.

“In comparison with typical ground-based radiometric monitoring, GIRO is anticipated to supply accuracy that’s 10 to 100 occasions higher,” Park mentioned. “This degree of precision is vital for planetary science as a result of it permits for way more detailed mapping of gravity fields, revealing refined options of a planet or moon’s inside construction.”

a blue orb surrounded by four smaller bright orbs on a black background

Uranus, its rings and two of its moons, Miranda and Ariel, as seen by the Hubble House Telescope. (Picture credit score: Science: NASA, ESA, STScI, Christian Soto (STScI). Picture Processing: Joseph DePasquale (STScI))

By matching the essential capabilities of previous missions like GRAIL, GIRO can lower prices and complexity through the use of light-weight, low-power radio elements whereas delivering correct gravity measurements, in accordance with Park.

This implies “gravity science might be performed as a part of broader exploration missions fairly than requiring devoted spacecraft,” he defined.

As well as, GIRO might open the door to exploring smaller celestial our bodies and distant planetary methods that may advance our understanding of how planets kind and evolve and whether or not they would possibly harbor the circumstances for all times.

Designing a GIRO gravity experiment comes with its personal set of challenges, most of which revolve round how the mission is deliberate. To get correct knowledge, the probes have to be launched into rigorously chosen orbits that not solely permit for exact gravity measurements but additionally preserve a powerful radio reference to the primary spacecraft.

For outer-planet missions, GIRO probes will probably be battery-powered, so all measurements have to be accomplished earlier than the batteries are depleted after 10 days. Nonetheless, for missions nearer to the solar, there’s an choice to recharge batteries utilizing daylight.

On high of that, the probe’s orbits should adjust to strict planetary safety guidelines, together with how lengthy they keep in orbit and the way they’re safely disposed of afterward to keep away from contaminating different worlds.

In accordance with Park, GIRO may technically be built-in right into a planetary mission inside one to 3 years. Although budgetary and political constraints would affect this timeline.

“Crucial milestones earlier than integration contain constructing and testing flight-like prototypes in environments that intently simulate precise mission circumstances,” Park mentioned. “As soon as these milestones are met and a mission alternative is recognized, GIRO might be integrated into the payload for upcoming missions, corresponding to these concentrating on asteroids, moons or outer planets.”



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