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Mara Johnson-Groh

Mara Johnson-Groh started freelancing for Eos in 2019. She received her master’s in astronomy from the University of Victoria in 2016 and started working as a science writer at NASA Goddard Space Flight Center thereafter. In the years since, she’s worked additionally as a freelance writer and photographer covering everything under the Sun, and even things beyond it, for a variety of publications including Scientific American, Discover, Live Science, Astronomy, AIP’s Scilights, Muse, and Hakai, among others.

Slice of a meteorite determined to have originated on Mars on the basis of its minerology and gases trapped in the rock.
Posted inNews

Martian Meteorites Shed Light on Solar System’s Early Dynamics

by Mara Johnson-Groh 24 May 20214 October 2021

Chemical compositions of rocks from Mars indicate that the earliest orbits of Jupiter and Saturn were more circular than they are today.

A view of Sunset Crater, one of many scoria cones in the San Francisco volcanic fields spanning northern Arizona
Posted inNews

Ancient Eruption May Change Our Understanding of Modern Volcanoes

by Mara Johnson-Groh 5 February 202112 April 2022

Bubbles trapped in magma from a 1,000-year-old event reveal how scoria cones might erupt and what impact they may have on the landscape and atmosphere.

A hilltop in the Crowsnest Forest Reserve, Alberta, Canada
Posted inNews

Canada’s Rocky Mountain Forests Are on the Move

by Mara Johnson-Groh 7 August 202011 December 2021

Using century-old surveying photos, scientists have mapped 100 years of change in the Canadian Rockies to document the climate-altered landscape.

Men on the deck of a research vessel collect samples from the Great Pacific Garbage Patch.
Posted inNews

Below the Great Pacific Garbage Patch: More Garbage

by Mara Johnson-Groh 4 June 20201 February 2023

New research is finding there’s more to marine debris than just what appears near the ocean surface, including tons of microplastics extending hundreds of meters into the deep.

Sakurajima volcano emits a cloud of ash
Posted inNews

Are Cosmic Rays a Key to Forecasting Volcanic Eruptions?

by Mara Johnson-Groh 21 April 20203 January 2023

A combination of relativistic particles and artificial intelligence may provide a new way to forecast when a volcano could erupt.

A purple and red curtain aurora provides a backdrop to the silhouette of a forest.
Posted inNews

Ancient Assyrian Aurorae Help Astronomers Understand Solar Activity

by Mara Johnson-Groh 31 December 20197 September 2022

Records of aurorae in Mesopotamia from 2,600 years ago are helping astronomers understand and predict solar activity today.

Brightly colored soil layers and a yardstick or ruler
Posted inNews

Looking for Prehistoric Pollen? Check the Floodplains

by Mara Johnson-Groh 3 December 20194 October 2021

A new methodology calculates the soil properties most likely to preserve pollen.

Composite satellite images of Jupiter’s Galilean moons: Io, Europa, Ganymede, and Callisto
Posted inNews

Jupiter’s Galilean Moons May Have Formed Slowly

by Mara Johnson-Groh 30 September 20193 December 2019

A new model is the first to simultaneously explain many of the moons’ characteristics, including their mass, orbits, and icy composition

Fishes swim in a coral reef
Posted inNews

Damselfish in Distress?

by Mara Johnson-Groh 31 May 201918 March 2022

Noise pollution may be changing how some species of fish develop.

eastern-mediterranean-map
Posted inNews

Ancient River Discovery Confirms Mediterranean Nearly Dried Up in the Miocene

by Mara Johnson-Groh 25 March 201926 January 2023

Sedimentary deposits reveal a Nile-sized river system flowing from what are today Turkey and Syria.

Features from AGU Journals

RESEARCH SPOTLIGHTS
JGR: Solid Earth
“New Tectonic Plate Model Could Improve Earthquake Risk Assessment”
By Morgan Rehnberg

EDITORS' HIGHLIGHTS
AGU Advances
“Eminently Complex – Climate Science and the 2021 Nobel Prize”
By Ana Barros

EDITORS' VOX
Perspectives of Earth and Space Scientists
“New Directions for Perspectives of Earth and Space Scientists”
By Michael Wysession


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