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Tom Metcalfe

A series of structures that look like electrical poles extend into the distance on an icy surface. The sky above is full of stars and streaked with green aurorae.
Posted inNews

A Weak Spot in Earth’s Magnetic Field Is Going from Bad to Worse

by Tom Metcalfe 10 November 202510 November 2025

This could be bad news for satellites and spacefarers.

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.

Swirly white and black rock
Posted inNews

From First Continents to Fancy Countertops

by Tom Metcalfe 18 April 202420 June 2024

A new study suggests melting gabbros may have helped form Earth’s first continents, riling a long-standing debate.

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

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Editors' Highlights

Episodic Tales of Salt  

10 December 20259 December 2025
Editors' Vox

Hydrothermal Circulation and Its Impact on the Earth System

3 December 20253 December 2025
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