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!

Stay on top of the latest market trends

Subscribe to Axios Markets for the latest market trends and economic insights. Sign up for free.

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!

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!

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

This illustration depicts dust orbiting Tabby's Star. Illustration: NASA/JPL-Caltech

Several theories surround what is known as the "most mysterious star in the universe" — one in the Milky Way that is slightly bigger than our Sun and whose sporadic dimming and brightening puzzles scientists.

New data, published Wednesday in The Astrophysical Journal Letters, suggests the flickering is likely caused by a cloud of small dust particles — and not an alien megastructure orbiting the star, as some researchers hypothesized.

Their methodology: The scientists observed "Tabby's Star," nicknamed after Louisiana State University astronomer Tabetha Boyajian who led the study, through the Las Cumbres Observatory from March 2016 to December 2017, during which the star's light dipped four times.

Their findings, detailed in The Atlantic: The dimming they observed was much deeper at blue wavelengths than at red wavelengths, meaning that the object blocking the star was not opaque (an opaque object would block both colors in equal measure). That discovery led Boyajian's team to the conclusion that cosmic dust particles "just big enough to stick inside the star's orbit, but too small to block light in all wavelengths" are responsible.

Key quote: "Therefore, whatever is passing between us and the star is not opaque, as would be expected from a planet or alien megastructure," Boyajian told The Atlantic.

Go deeper

Bryan Walsh, author of Future
2 hours ago - Politics & Policy

Axios AM Deep Dive: America’s murder surge

Photo illustration: Sarah Grillo/Axios. Photo: Erik McGregor/LightRocket via Getty Images

Homicides rose at the fastest rate in at least six decades last year. This Axios AM Deep Dive, led by Future correspondent Bryan Walsh, looks at the state of gun crime.

6 hours ago - Politics & Policy

Senate Democrats target billionaires

Illustration: Annelise Capossela/Axios

After failing to get a deal on other planned tax increases, key Senate Democrats are pivoting to a billionaires' income tax to pay for President Biden's social spending.

The big picture: No advanced economy has attempted anything similar on such a scale.

Anti-abortion activists' Supreme Court dreams are coming true

Photo illustration: Annelise Capossela. Photos: Kevin Dietsch/Getty Images

This is the moment the conservative legal movement has been building toward for decades: The solidly conservative Supreme Court is about to hear two major abortion cases within a month of each other.

Why it matters: All of this is likely to end with significant new restrictions on abortion and a clear path for Republican-led states to win the next big abortion cases, too — the culmination of a long and bitter fight for control of the judiciary.

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!