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orbits & rotations

A 13th century artist’s depiction of an eclipse
Posted inResearch Spotlights

Core Movements Could Be Causing Tiny Shifts in Earth’s Spin Speed

Sarah Derouin, Science Writer by Sarah Derouin 9 December 20249 December 2024

Researchers use ancient eclipse data and new machine learning techniques to understand what processes changed the length of Earth’s days over the past 3,000 years.

The dusty, dark gray surface of the Moon, with bootprints around a light-colored apparatus. The dark reflective face of the apparatus is angled slightly upward.
Posted inNews

The Relatively Messy Problem with Lunar Clocks

by Matthew R. Francis 14 November 202414 November 2024

Using Einstein’s theory of general relativity, physicists found that clocks on the Moon would run 56 microseconds faster than clocks on Earth. That finding will help future lunar missions navigate.

A hand holds a disc of ice between thumb and forefinger while the person’s other hand points at it with the little finger. On a surface below, a ruler can be seen.
Posted inNews

Centennial-Scale Jumps in CO2 Driven by Earth’s Tilt

Katherine Kornei, Science Writer by Katherine Kornei 8 November 20248 November 2024

Antarctic ice records uncovered seven previously unknown jumps in atmospheric carbon dioxide. These events may have been driven by changes in Earth’s tilt.

An artist’s rendering of a striped gas planet close to a star
Posted inNews

Magnetic Barriers Might Explain Mysterious Hot Jupiters

by Jonathan O’Callaghan 3 June 20243 June 2024

Hot Jupiters might end up very close to stars because a magnetic field halts their progress—and future observations could confirm the idea.

Colored lines in a spiral pattern overlay a plain white sphere.
Posted inNews

Spiral Waves May Explain the Sun’s Baffling Rotation

by Matthew R. Francis 29 May 202429 May 2024

New observations and models show a connection between high-latitude waves in the Sun’s interior and the different rates of spin between the solar equator and poles.

A ring of yellow light in an otherwise black sky.
Posted inFeatures

The End of the Eclipse

Damond Benningfield, Science Writer by Damond Benningfield 26 March 202412 February 2025

Scientists are studying how the Earth–Moon distance has changed over time, and what effect that change might have had on our planet. Future changes will extinguish total solar eclipses entirely.

A bed of sand underwater.
Posted inNews

Mars as a Driver of Deep-Sea Erosion

by Grace van Deelen 25 March 202426 March 2024

An analysis of breaks in deep-sea sediment links the geological record to a 2.4-million-year cycle that heats Earth and ventilates our oceans.

Map of stars in the Milky Way
Posted inNews

Passing Stars Shorten Earth’s Time Horizon

Kimberly M. S. Cartier, News Writing and Production Intern for Eos.org by Kimberly M. S. Cartier 19 March 202419 March 2024

Stars in the solar neighborhood could jostle planetary orbits, making it harder to turn back the clock and examine Earth’s orbital or climate history.

Gray and cratered Mimas hovers in front of Saturn with its rings seen edge on.
Posted inNews

That’s No Moon; It’s an Ocean World

Kimberly M. S. Cartier, News Writing and Production Intern for Eos.org by Kimberly M. S. Cartier 7 February 20248 January 2025

If Saturn’s cratered moon Mimas has liquid water beneath its surface, ocean worlds might be far more common in the solar system than we thought.

Illustration showing the orbits of three planets around a red star, with depictions of what the planets might look like
Posted inNews

Giant Planets May Be “Agents of Chaos”

Damond Benningfield, Science Writer by Damond Benningfield 18 December 202318 December 2023

Two studies suggest that some giants could make it difficult or even impossible for terrestrial planets to remain in a star’s habitable zone.

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Features from AGU Publications

Research Spotlights

Proposed Experiment Could Clarify Origin of Martian Methane

12 May 202512 May 2025
Editors' Highlights

First Benchmarking System of Global Hydrological Models

7 May 20257 May 2025
Editors' Vox

Decoding Crop Evapotranspiration

6 May 20256 May 2025
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