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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

3 mins ago - Politics & Policy

Democrats brace for staredown over paid family medical leave

House Ways and Means Committee Chairman Richard Neal. Photo: Win McNamee/Getty Images

Senior House Democrats are braced for battle with the Senate over whether paid family medical leave — a key priority for progressives — will be included in President Biden’s final budget reconciliation bill, lawmakers and aides tell Axios.

Why it matters: Sen. Joe Manchin (D-W.Va.) has indicated he wants to cut the program to reduce the bill's price tag. “Paid family and medical leave must be in the final package,” Rep. Richard Neal (D-Mass.), chairman of the House Ways and Means Committee, told Axios on Monday.

36 mins ago - World

Poland showdown is EU's Jan. 6 moment, top official says

Didier Reynders. Photo: Thierry Monasse/Getty Images

Poland and Hungary have forced a moment of reflection on the European Union — similar to the one in the U.S. after the Jan. 6 insurrection, EU Justice Commissioner Didier Reynders told Axios.

What he's saying: "During many years, we have had in our minds that it was granted that if you are a member of the EU, of course you apply the rule of law; you have full respect for democracy, fundamental rights and so on — maybe with some concerns but with a real intention to adapt your legislation to be in full compliance [with EU law]," Reynders said.

The E-commerce shopping spree

Illustration: Aïda Amer/Axios

Retailers have gotten really good at selling stuff online. So much so, investors want them to separate from the business units that do just that.

Why it matters: Spinning off these crown jewels may jeopardize both the physical and e-commerce sides of the companies in the long run by breaking the benefits of hybrid operations, analysts say.