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unsolved mysteries

An aerial photograph of a remote, forested lake surrounded by forest.
Posted inFeatures

Hunting for Methane Hot Spots at the Top of the World

Jenessa Duncombe, Staff Writer by Jenessa Duncombe 26 April 202326 April 2023

A visit to an Alaskan wetland with some of the world’s highest lake marsh methane emissions brings scientists one step closer to understanding the phenomenon.

A circular cloud of black and blue dust shadows a small white star.
Posted inNews

Molten Meteorites Didn’t Deliver Earth’s Water

by Caroline Hasler 25 April 202325 April 2023

A new study has ruled out large, once-molten meteorites called achondrites as sources of Earth’s water.

A satellite image of the surface of Mars showing snaking channels and other water-sculpted features
Posted inNews

Asteroid Impacts Could Have Warmed Ancient Mars

Katherine Kornei, Science Writer by Katherine Kornei 17 April 202317 April 2023

Hydrogen released during large impacts might have boosted Mars’s surface temperature above freezing for thousands or even millions of years, enabling liquid water to flow over the Red Planet.

Artist’s impression of a sub-Neptune or gas dwarf exoplanet
Posted inNews

Hydrogen May Push Some Exoplanets off a Cliff

by Julie Nováková 10 April 202310 April 2023

High-pressure reactions of hydrogen and iron could explain gaps in the distribution of exoplanets.

Una ilustración mostrando a la Tierra en el espacio con una sección que deja ver sus capas internas en colores rojos y naranjas brillantes.
Posted inResearch Spotlights

El hierro está en el centro de este debate de las ciencias de la Tierra

Aaron Sidder, freelance science writer by Aaron Sidder 6 April 20236 April 2023

Un nuevo estudio investiga el estado del hierro en el interior del planeta. Los hallazgos tienen repercusiones para comprender la estructura del núcleo interno.

Color view of Europa from Galileo that shows the largest portion of the moon’s surface at the highest resolution.
Posted inNews

Newly Discovered Salts May Exist on Icy Moons

by Derek Smith 23 March 202311 April 2023

For the first time in more than a century, scientists have identified new sodium chloride crystals. The discovery may reconcile puzzling spectroscopic images of Europa’s surface.

Global map showing upper-level atmospheric winds
Posted inEditors' Highlights

Better Resolution Might Unlock the Mystery of Storms

by Bjorn Stevens 13 March 202324 March 2023

Climate models have many persistent and systematic biases, but a new study shows that allowing for a physical rather than statistical representation of energy transport reduces one of them.

An illustration showing a cross section of Earth
Posted inResearch Spotlights

Iron Is at the Core of This Earth Science Debate

Aaron Sidder, freelance science writer by Aaron Sidder 10 March 20236 April 2023

A new study investigates iron’s form at the planet’s interior. The findings have repercussions for understanding the inner core’s structure.

Close-up view of bright green algae fronds
Posted inScience Updates

Making Sense of the Great Barrier Reef’s Mysterious Green Donuts

by Jody Webster, Mardi McNeil, Helen Bostock, Luke Nothdurft and Maria Byrne 9 March 202321 December 2023

Researchers set sail to the Great Barrier Reef to study how ring-shaped algae deposits formed and evolved, what feeds them, and the diversity of creatures that call them home.

A cratered planet and its smaller moon appear silhouetted against a dark background.
Posted inNews

Marauding Moons Spell Disaster for Some Planets

Katherine Kornei, Science Writer by Katherine Kornei 6 March 20236 March 2023

In solar systems beyond our own, some moons might eventually collide with their host planets, new simulations suggest.

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Features from AGU Publications

Research Spotlights

An Ecosystem Never Forgets

19 December 202519 December 2025
Editors' Highlights

Frictional Properties of the Nankai Accretionary Prism

11 December 20259 December 2025
Editors' Vox

Hydrothermal Circulation and Its Impact on the Earth System

3 December 20253 December 2025
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