A novel method uses gravity data to determine where density anomalies lie inside planetary bodies.

Sarah Stanley
Sarah Stanley, a freelance writer for Eos, has a background in environmental microbiology but covers a wide range of science stories for a variety of audiences. She has also written for PLOS, the University of Washington, Kaiser Permanente, Stanford Medicine, Gladstone Institutes, and Cancer Commons, a nonprofit that works with cancer patients.
Family Trees Clarify Relationships Among Climate Models
A new genealogy based on similarities in the computer codes of different climate models could improve studies that combine projections from multiple models.
Volcanoes’ Future Climate Effects May Exceed Standard Estimates
Future releases of sulfur dioxide from volcanoes will likely be higher than the reconstructed historical levels currently used for climate predictions.
Plants Leave Chemical Fingerprints on an Ozone-Depleting Gas
A first-of-its-kind study suggests that isotope analysis could be used to pinpoint sources and sinks of atmospheric methyl chloride.
Rougher Faults May Generate More Earthquake Aftershocks
Lab experiments on pieces of granite reflect natural aftershock dynamics and highlight the role of rock roughness along a fault.
How Space Storms Miscue Train Signals
Geomagnetic storms could significantly disrupt electrified train operations in the United Kingdom once every few decades, according to a new study.
Mapping the Fizzy Brines and Fluid-Filled Fractures Below a Volcano
Seismic tools reveal where hydrothermal fluids lie beneath the Uturuncu volcano in Bolivia and hint at their composition.
A New Measure of Roughness Could Advance Earthquake Geophysics
Scientists recently developed an alternative way to measure a rock’s roughness. It might help them understand the physics of faults.