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!

This composite image shows an exoplanet (the red spot) orbiting the brown dwarf 2M1207. This is the first exoplanet directly imaged. Image: ESO/Chauvin et al.

Figuring out whether a planet is habitable will take more than just understanding its orbit. According to a new study in the journal Science, scientists will also need to study a world’s atmosphere, magnetic field and even geological composition in order to really know if it’s capable of hosting life.

The big picture: Researchers have been hunting for habitable exoplanets using space and ground-based telescopes for years, but assessing whether a world can support life or not is difficult.

What they are looking for:

  • Considerable time is spent focusing on whether a planet is in its star’s “habitable zone” — an orbit in which liquid water can be sustained on the surface — but that alone can’t predict whether life will exist.
  • “To focus the search for extraterrestrial life, scientists must assess which features of Earth are essential to the development and sustenance of life for billions of years and whether the formation of such planets is common,” the study says.

Details: While understanding an exoplanet’s atmosphere is a good way to start a hunt for life, scientists will also need to learn more about a planet’s composition to see if it’s Earth-like.

  • “The heart of habitability lies in the planetary interior,” the study says.
  • If a world’s core is liquid iron like Earth’s, it could produce a sufficiently strong magnetic field to shield its surface from incoming harmful radiation, protecting water and possible life on its surface.

Even plate tectonics have bearing on habitability because the cycling of a planet’s crust helps control its climate, the study notes.

“By having these different variables, we can say this is the most likely — of all the planets that have been found — this one is the most likely to be habitable or to be most Earth-like,” study co-author Anat Shahar of the Carnegie Institution for Science told Axios.

What’s next: Although scientists have discovered thousands of exoplanets so far, very few of them are thought to be potentially habitable. However, as more powerful telescopes come online, researchers should gain a better understanding of what secrets these planets may be hiding.

Go deeper

Updated 11 mins ago - Politics & Policy

Omicron dashboard

Illustration: Aïda Amer/Axios

  1. Health: Omicron fuels the case for COVID boosters — Omicron variant lifts Moderna's stock price — CDC strengthens COVID booster recommendation.
  2. Politics: Biden says fight against Omicron won't include "shutdowns or lockdowns."
  3. States: Federal court blocks Biden's vaccine mandate for health workers in 10 states — NYC urges masks indoors "at all times" regardless of vaccination status — New York declares state of emergency amid concerns over Omicron.
  4. World: Omicron adds urgency to vaccinating worldWHO warns against travel bans on southern African countries — First North American Omicron cases identified in Canada.
  5. Variant tracker: Where different strains are spreading.
Kendall Baker, author of Sports
Updated 20 mins ago - Sports

College football gone mad

Former Notre Dame coach Brian Kelly walks in front of his players. Photo: David Madison/Getty Images

In the span of two days, the head coaches of two of the biggest college football programs in America have jumped ship, wooed by even greater challenges — and the almighty dollar.

Driving the news: Lincoln Riley is ditching Oklahoma for USC in a deal reportedly worth $110 million. LSU poached Brian Kelly from Notre Dame with a reported 10-year, $100 million contract.

Media startups anxiously await BuzzFeed’s stock market debut

Illustration: Sarah Grillo/Axios

Digital media companies considering going public are watching BuzzFeed's expected stock market debut next week to see how investors will respond.

Why it matters: A slowdown in SPACs (special purpose acquisition companies) earlier this year pushed some digital media companies that were considering going public via SPAC IPOs away from the idea, such as Vice.