Alexandra Witze

I'm a science journalist in Boulder, Colorado.

I report on the earth, planetary and astronomical sciences for Nature and other journalism clients. Book work includes co-authoring ISLAND ON FIRE, about Icelandic volcanoes, and managing the ANNALS OF THE DEEP SKY amateur astronomy book series. Reach me at witzescience@gmail.com.

American Indian Magazine • 11th August 2025

Robots that speak to many

Danielle Boyer is an Anishinaabe engineer and inventor who uses science and technology to preserve Indigenous languages.

Nature • 17th July 2025

How to avoid nuclear war in an era of AI and misinformation

The Doomsday Clock sits at 89 seconds to midnight, nearer than it has ever been to signalling our species’ point of no return.

Nature • 6th June 2025

Trump wants to put humans on Mars — here’s what scientists think

A space agency in turmoil confronts an incredibly ambitious challenge.

Nature • 27th March 2025

75% of US scientists who answered Nature poll consider leaving

The unscientific survey is a glimpse into the mindset of some US scientists. “Don’t want to leave, but what’s the alternative?”

Nature • 18th March 2025

How astronomers are learning to live with satellite constellations

“There is growing interest in collaborating and finding solutions together,” says space-policy researcher Giuliana Rotola.

Nature • 22nd January 2025

The physics of urban firestorms

Why fires spread quickly in modern cities — and how to slow them.

Nature • 19th December 2024

Dread and determination: how climate scientists are preparing for Trump 2.0

Many are bracing themselves.

Nature • 14th October 2024

Is there life on Jupiter’s moon Europa? NASA launches mission to find hints

The spacecraft will investigate a vast ocean buried under the icy crust of Jupiter's moon Europa.

American Indian Magazine • 30th September 2024

Inspiring youth to reach for the stars

Astronaut Nicole Mann is the first Native American woman to travel to space.

Nature • 29th May 2024

How NASA astronauts are training to walk on the Moon in 2026

I joined mission control in Houston to see how the space agency is incorporating science into its Artemis III planning.

Nature • 6th March 2024

Geologists reject the Anthropocene as Earth’s new epoch — after 15 years of debate

“This is actually an invitation for us to completely rethink how we define what the world is experiencing," says Zoe Todd, an anthropologist at Simon Fraser University in Burnaby, Canada.

Nature • 6th February 2024

Santorini’s volcanic past: underwater clues reveal giant prehistoric eruption

One of the world’s most-studied volcanoes turns out to be hiding plenty of secrets.

Nature • 12th January 2024

Earth boiled in 2023 — will it happen again in 2024?

2023 is the hottest year on record, shattering previous records and the expectations of many climate scientists.

Nature • 16th October 2023

How would we know whether there is life on Earth? This bold experiment found out

A paper in Nature 30 years ago changed how scientists thought about looking for life on other planets.

Nature • 6th September 2023

An ‘alien meteorite’ probably didn’t slam into Earth — how will we know if one does?

It might soon become possible to study the entire history of the Milky Way through interstellar objects.

Science News • 24th August 2023

How one device could help transform our power grid

Grid-forming inverters may be key to integrating more solar and wind energy.

Nature • 26th May 2023

Saving the iconic Colorado River — scientists say latest plan is not enough

The river, battered by overuse, drought and climate change, has been drying up.

Nature • 8th May 2023

Ethics in outer space: can we make interplanetary exploration just?

The prospect of settling the Moon, Mars and elsewhere requires urgent conversations about issues such as labour and reproductive rights far from Earth.

Nature • 30th January 2023

Will an AI be the first to discover alien life?

SETI, the search for extraterrestrial intelligence, is deploying machine-learning algorithms that filter out Earthly interference and spot signals humans might miss.

Science News • 27th January 2023

It's possible to reach net-zero carbon emissions. Here's how

The key to a decarbonized future lies in producing vast amounts of new electricity from sources that emit little to no greenhouse gases, and then transforming as much of our lives and our industries as possible to run off those sources.

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