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Home NASA

NASA growing 1st-ever space-based quantum sensor for gravity measurements

April 18, 2025
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NASA growing 1st-ever space-based quantum sensor for gravity measurements
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Scientists are growing a complicated quantum sensor for low Earth orbit that may detect the tiniest tremors in Earth’s gravity.

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These barely perceptible shifts — attributable to transferring water, tectonic exercise or shifting rock — provide clues about what lies beneath the planet’s floor.

The brand new machine might permit the mapping of underground options like aquifers and mineral deposits — essential knowledge for navigation, useful resource administration and nationwide safety, its builders say.

“We might decide the mass of the Himalayas utilizing atoms,” Jason Hyon, chief technologist for Earth Science at NASA’s Jet Propulsion Laboratory in Southern California and director of JPL’s Quantum House Innovation Heart, mentioned in an April 15 statement.


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Associated: How a quantum sensor on the ISS might revolutionize area exploration

Quantum sensors, just like the Quantum Gravity Gradiometer Pathfinder (QGGPf) instrument developed by JPL, non-public firms and tutorial establishments, use clouds of atoms dropped in freefall and cooled to close absolute zero.

As they fall, lasers act like mirrors and splitters, separating the atoms after which bringing them again collectively. The way in which the atoms intrude after they recombine reveals how a lot they have been accelerated by gravity, permitting scientists to measure the tiniest modifications in gravity with excessive precision.

Breaking area information, the newest updates on rocket launches, skywatching occasions and extra!

These cutting-edge instruments, based mostly on a way referred to as atom interferometry, are way more delicate than conventional devices — and so they’re nonetheless enhancing. Researchers at the moment are refining the expertise to make it much more correct and sturdy.

“With atoms, I can assure that each measurement would be the identical. We’re much less delicate to environmental results,” Sheng-wey Chiow, an experimental physicist at JPL, mentioned in the identical assertion.

As a result of it makes use of atoms as a substitute of cumbersome mechanical elements, the QGGPf sensor is surprisingly compact — in regards to the measurement of a small washer — and weighs simply 275 kilos (125 kilograms). That makes it a lot smaller and lighter than conventional space-based gravity devices, which is a giant benefit for area missions, the place measurement, weight and launch prices are tightly constrained.

NASA plans to offer the brand new sensor an in-space take a look at close to the top of the last decade. The expertise demonstration mission will put a collection of cutting-edge instruments to the take a look at, pushing the bounds of how mild and atoms work together on the smallest scales.

“Nobody has tried to fly considered one of these devices but,” mentioned Ben Stray, a postdoctoral researcher at JPL. “We have to fly it in order that we will work out how properly it’s going to function, and that may permit us to not solely advance the quantum gravity gradiometer, but in addition quantum expertise typically.”



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