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 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!

Denver news in your inbox

Catch up on 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!

Des Moines news in your inbox

Catch up on 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!

Minneapolis-St. Paul news in your inbox

Catch up on 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!

Tampa Bay news in your inbox

Catch up on 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!

Charlotte news in your inbox

Catch up on 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!

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

The asteroid Bennu ejecting particles from its surface on Jan. 19, as seen from cameras aboard NASA’s OSIRIS-REx spacecraft. Photo: NASA

The near-Earth asteroid Bennu is an active asteroid that periodically ejects rocky material into space, according to early results from NASA's OSIRIS-REx Mission.

Why it matters: This is surprising, as the vast majority of known asteroids are inactive. In addition, NASA scientists hoping to land a spacecraft on Bennu to take samples back to Earth in 2023 have found the asteroid contains larger rocks than earlier thought, which could complicate the sampling mission.

What they found: The OSIRIS-REx mission began orbiting the asteroid on Dec. 31, seeking to learn more about its composition and movement. It's thought that some asteroids may contain material dating back to the beginning of our solar system, NASA says.

  • The NASA research team first noticed the plumes of material emanating from Bennu on Jan. 6, and they've detected at least 11 more of them during the past 2 months. Some of the material has wound up orbiting Bennu as satellites before settling back down on its surface.

“The discovery of plumes is one of the biggest surprises of my scientific career,” said Dante Lauretta, OSIRIS-REx principal investigator at the University of Arizona, Tucson. “We don’t know the mechanism that is causing this right now," he said.

  • From distant observations, Bennu appeared to have a mostly flat surface with some large boulders.
  • However, close-up views showed Bennu's surface is rather rough, with at least 200 boulders of at least 33 feet wide.
  • This means the team has to re-evaluate its plans for how to safely land on the asteroid and collect samples from its surface.

One cool thing: Scientists have identified magnetite on Bennu's surface, which is indicative of interactions between rock and liquid water, most likely on the parent body that the asteroid spun off from.

Meanwhile, some of the first discoveries of Japan's Hayabusa2 mission to the asteroid Ryugu were revealed in a series of studies published in Science on Tuesday.

  • The studies measure the characteristics of the asteroid, such as its density, spin, shape and more.
  • They found Ryugu has a low density and is a "rubble pile" of rocks that congealed in a surreal, spinning-top shape that may one day spin itself apart.

Go deeper

Why made-for-TV moments matter during the pandemic

Photo illustration: Sarah Grillo/Axios. Photos: Erin Schaff-Pool, Biden Inaugural Committee via Getty Images

In a world where most Americans are isolated and forced to laugh, cry and mourn without friends or family by their side, viral moments can offer critical opportunities to unite the country or divide it.

Driving the news: President Biden's inauguration was produced to create several made-for-social viral moments, a tactic similar to what the Democratic National Committee and the Biden campaign pulled off during the Democratic National Convention.

Updated 8 hours ago - World

Over 3,000 detained in protests across Russia demanding Navalny's release

Russian police officers beat protestesters at a rally against of jailing of oppositon leader Alexei Navalny in Moscow on Saturday. Photo: Mikhail Svetlov/Getty Images

Police in Russia on Saturday arrested more than 3,300 people as protesters nationwide demanded that opposition leader Alexey Navalny be released from jail.

Details: Demonstrations began in the eastern regions of Russia and spread west to more than 60 cities.

Updated 9 hours ago - Politics & Policy

Arizona Republicans censure Cindy McCain and GOP governor

Combination images of Cindy McCain and Gov. Doug Ducey. Photo: FilmMagic/FilmMagic for U.S.VETS/Michael Brochstein/SOPA Images/LightRocket via Getty Images

Arizona Republican Party members voted on Saturday to censure prominent GOP figures Cindy McCain, Gov. Doug Ducey and former Sen. Jeff Flake (R-Ariz.), who've all faced clashes with former President Trump.

Why it matters: Although the resolution is symbolic, this move plus the re-election of the Trump-endorsed Kelli Ward as state GOP chair shows the strong hold the former president has on the party in Arizona, despite President Biden winning the state in the 2020 election.