Sign up for our daily briefing

Make your busy days simpler with Axios AM/PM. Catch up on what's new and why it matters in just 5 minutes.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Catch up on the day's biggest business stories

Subscribe to Axios Closer for insights into the day’s business news and trends and why they matter

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Sign up for Axios Pro Rata

Dive into the world of dealmakers across VC, PE and M&A with Axios Pro Rata. Delivered daily to your inbox by Dan Primack and Kia Kokalitcheva.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Sports news worthy of your time

Binge on the stats and stories that drive the sports world with Axios Sports. Sign up for free.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Tech news worthy of your time

Get our smart take on technology from the Valley and D.C. with Axios Login. Sign up for free.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Get the inside stories

Get an insider's guide to the new White House with Axios Sneak Peek. Sign up for free.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Catch up on coronavirus stories and special reports, curated by Mike Allen everyday

Catch up on coronavirus stories and special reports, curated by Mike Allen everyday

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Want a daily digest of the top Denver news?

Get a daily digest of the most important stories affecting your hometown with Axios Denver

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Want a daily digest of the top Des Moines news?

Get a daily digest of the most important stories affecting your hometown with Axios Des Moines

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Want a daily digest of the top Twin Cities news?

Get a daily digest of the most important stories affecting your hometown with Axios Twin Cities

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Want a daily digest of the top Tampa Bay news?

Get a daily digest of the most important stories affecting your hometown with Axios Tampa Bay

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Want a daily digest of the top Charlotte news?

Get a daily digest of the most important stories affecting your hometown with Axios Charlotte

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Want a daily digest of the top Nashville news?

Get a daily digest of the most important stories affecting your hometown with the Axios Nashville newsletter.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Want a daily digest of the top Columbus news?

Get a daily digest of the most important stories affecting your hometown with the Axios Columbus newsletter.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Want a daily digest of the top Dallas news?

Get a daily digest of the most important stories affecting your hometown with the Axios Dallas newsletter.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Want a daily digest of the top Austin news?

Get a daily digest of the most important stories affecting your hometown with the Axios Austin newsletter.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Want a daily digest of the top Atlanta news?

Get a daily digest of the most important stories affecting your hometown with the Axios Atlanta newsletter.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Want a daily digest of the top Philadelphia news?

Get a daily digest of the most important stories affecting your hometown with the Axios Philadelphia newsletter.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Want a daily digest of the top Chicago news?

Get a daily digest of the most important stories affecting your hometown with the Axios Chicago newsletter.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Sign up for Axios NW Arkansas

Stay up-to-date on the most important and interesting stories affecting NW Arkansas, authored by local reporters

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Want a daily digest of the top DC news?

Get a daily digest of the most important stories affecting your hometown with the Axios DC newsletter.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

The aurora borealis — which results from disturbances in the Earth's magnosphere caused by solar winds — seen above Murmansk, Russia, last month. Photo: Lev Fedoseyev\TASS via Getty Images

The Earth's magnetic poles temporarily reversed themselves 42,000 years ago, triggering environmental catastrophe, according to a new study.

Why it matters: The research sheds new light on a period of chaotic climatic change and human upheaval — and provides a warning that the same thing could happen to us.

Driving the news: In a study published Thursday in Science, researchers analyzed the rings found in ancient kauri trees in New Zealand to produce a radiocarbon archive.

  • The tree ring data shows that nearly 42,000 years ago, the Earth's geomagnetic field flipped and stayed reversed for some 800 years before returning to normal.

What happened: Scientists knew that the reversal — called the Laschamp Excursion — had happened, but the new study provides a more accurate time frame.

  • It also shows just how catastrophic the event likely was for the Earth and those living on it, including humans and their evolutionary cousins the Neanderthals.
  • With virtually no protective magnetic field, and with solar activity at an ebb, the planet was bombarded with high-energy particles from outer space, leading to rapid climate change and spectacular electrical storms.
  • It would have been "like the end of days," said Chris Turney, an Earth scientist at the University of New South Wales and a lead co-author on the paper, in a statement.

What's next: Earlier research has indicated that the Earth's magnetic north pole has been moving at an accelerating pace, which could presage another reversal.

Go deeper

Updated 2 hours ago - Politics & Policy

Shooting at Michigan high school leaves 3 dead, 8 wounded

Police cars restrict access to Oxford High School following the shooting in Oxford, Michigan, on Tuesday. Photo: Matthew Hatcher/Getty Images)

A 15-year-old sophomore was arrested after a shooting at a Michigan high school that left three people dead and eight others wounded Wednesday, according to the Oakland County Sheriff's Office.

The latest: Oakland County Sheriff Michael Bouchard said at a briefing Tuesday night that the suspect's father had on Friday bought the 9mm Sig Sauer pistol investigators believe was used in the shooting at Oxford High School. Authorities released the names of the victims late Tuesday.

City Council member Andre Dickens wins Atlanta mayoral race

Atlanta Mayor-elect Andre Dickens in Atlanta, Georgia, late Tuesday. Photo: Paras Griffin/Getty Images

City Council member Andre Dickens won a runoff election Tuesday to become Atlanta's next mayor, soundly beating the council's president Felicia Moore.

The big picture: Dickens was just a few months ago considered to have an outside chance of replacing Mayor Keisha Lance Bottoms, who announced in May that she wouldn't seek a second term.

UN report: Pandemic set to cost global tourism $2 trillion in 2021

A tourist in front of the Eiffel Tower in Paris on Nov. 25. Photo:Chesnot/Getty Images

A new United Nations report warns that global tourism will see only modest revenue gains in 2021 after last year's historic losses amid the COVID-19 pandemic.

Why it matters: Tourism revenues in 2020 fell by more than half from the previous year — a significant blow to the global economy, according to analysis by the UN World Tourism Organization (UNWTO).

You’ve caught up. Now what?

Sign up for Mike Allen’s daily Axios AM and PM newsletters to get smarter, faster on the news that matters.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!