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geochemistry

A satellite view of a portion of Earth shows the planet’s curved horizon at the top of the image. Green and brown landmasses are cut by two large, blue, winding rivers that empty into the ocean in the foreground. Clouds are visible on the edges of the image.
Posted inResearch Spotlights

New River Chemistry Insights May Boost Coastal Ocean Modeling

Sarah Stanley, Science Writer by Sarah Stanley 9 January 20269 January 2026

By more realistically accounting for river inputs, researchers reduced overestimation of the amount of carbon dioxide absorbed by coastal waters.

Enceladus’s horizon backlit by the Sun, highlighting several plumes of material coming from the surface.
Posted inNews

Speedy Flyby Adds New Organics to Enceladus’s “Primordial Soup”

Kimberly M. S. Cartier, News Writing and Production Intern for Eos.org by Kimberly M. S. Cartier 12 November 202512 November 2025

A new analysis of old Cassini data has also verified past detections of complex organics in Saturn’s E ring, strengthening the chemical ties between the ring and its progenitor.

Close-up image of niobium crystals
Posted inNews

To Find Critical Minerals, Look to Plate Tectonics

by Hannah Richter 21 October 202521 October 2025

A study of “weird” Australian rocks suggests stores of niobium rose to the surface during the breakup of the supercontinent Rodinia.

Illustration of plumes erupting from the surface of Enceladus
Posted inNews

Space Radiation Can Produce Some Organic Molecules Detected on Icy Moons

Javier Barbuzano, Science Writer by Javier Barbuzano 14 October 202514 October 2025

As missions prepare to visit ocean worlds like Enceladus and Europa, new findings show scientists must first learn to distinguish between radiation-made organics and those born in a subsurface sea.

An image of the Milky Way, as seen from the Chilean desert.
Posted inNews

Zircon Crystals Could Reveal Earth’s Path Among the Stars

by Tom Metcalfe 10 October 202510 October 2025

Researchers found signs of melting in zircon crystals in the crust that correspond to our planet’s journey through the galaxy’s spiral arms.

A beach in the Florida Keys
Posted inNews

Shallow Injection Imperfectly Filters Florida Wastewater

by Caroline Hasler 26 September 202526 September 2025

Injection of wastewater into shallow wells is meant to filter nutrients like nitrogen and phosphorus out of the wastewater. But a new study suggests that nutrients aren’t entirely eliminated—and may be polluting coastal waters.

The Perseverance Mars rover, a robot, pictured in front of a red landscape on Mars.
Posted inResearch & Developments

Perseverance Sample Shows Possible Evidence of Ancient Martian Microbial Metabolisms

by Grace van Deelen 10 September 202510 September 2025

A sample collected in July 2024 by NASA’s Perseverance Mars rover may be “the closest we’ve actually come to discovering ancient life on Mars,” according to Nicky Fox, the science head of NASA.

A person in yellow and green protective gear walks past a semi burned house with a mountain backdrop.
Posted inFeatures

When Disaster Science Strikes Close to Home

Kimberly M. S. Cartier, News Writing and Production Intern for Eos.org by Kimberly M. S. Cartier 26 August 202526 August 2025

How have scientists across Los Angeles used their skills to help their communities recover from the 2025 fires?

A researcher collects a sample of dust near a structure burned in the Eaton Fire.
Posted inFeatures

Burning Urban and Wild Land Alike

Kimberly M. S. Cartier, News Writing and Production Intern for Eos.org by Kimberly M. S. Cartier 26 August 202526 August 2025

When more densely populated Altadena and Pacific Palisades burned along with surrounding wildlands, hazards for residents didn’t stop when the fires were contained.

A light tan world marked with bright white craters from meteor impacts
Posted inNews

Infrared Instruments Could Spot Exotic Ice on Other Worlds

by Matthew R. Francis 19 August 202519 August 2025

Phases of ice that exist naturally only on frozen moons could be detected using infrared spectroscopy, according to new laboratory experiments.

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A view of a bridge, with the New Orleans skyline visible in the distance between the bridge and the water. A purple tint, a teal curved line representing a river, and the text “#AGU25 coverage from Eos” overlie the photo.

Features from AGU Publications

Research Spotlights

Denitrification Looks Different in Rivers Versus Streams

16 January 202616 January 2026
Editors' Highlights

Kyanite Exsolution Reveals Ultra-Deep Subduction of Continents

23 January 202622 January 2026
Editors' Vox

Bridging the Gap: Transforming Reliable Climate Data into Climate Policy

16 January 202616 January 2026
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