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The remnant of a supernova. Photo: NASA/CXC/F. Vogt et al./ESO/VLT/MUSE/STScI

Radioactive dust sent out by ancient supernovas has been found in Antarctica, according to a new study in the journal Physical Review Letters.

The big picture: Researchers behind the study suggest that our solar system is currently flying through a cloud of cosmic material thought to be shaped by supernovas.

  • Those stellar explosions may leave behind traces of the radioactive isotope iron-60, which the scientists found in Antarctic snow.
  • This study and future work could help explain more about our solar system’s past and its movements through the Milky Way, according to a synopsis published by the American Physical Society.

What they found: The team behind the study thinks that the iron-60 atoms found in the region were delivered to Earth in the last 20 years.

  • "I think Earth essentially picked [the element] up during the movement through the cloud, not like a real injection as you would expect from a very near supernova," Dominik Koll, an author of the study, tells Axios by email.
  • The scientists had been concerned that the isotope might have been created by nuclear weapons, but the team ruled that out when the other concentrations of bomb-created isotopes didn't match what they found in Antarctica.

What's next: Koll and his colleagues are hoping to get a look at older Antarctic snow in order to compare concentrations of iron-60 in the past to those found today.

  • Older samples may reveal exactly when our solar system traveled into the supernova-enriched cloud it appears to find itself within now.

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Trump's legacy is shaped by his narrow interests

Illustration: Annelise Capossela/Axios

President Trump's policy legacy is as much defined by what he's ignored as by what he's involved himself in.

The big picture: Over the past four years, Trump has interested himself in only a slim slice of the government he leads. Outside of trade, immigration, a personal war against the "Deep State" and the hot foreign policy issue of the moment, Trump has left many of his Cabinet secretaries to work without interruption, let alone direction.

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AI and automation are creating a hybrid workforce

Illustration: Annelise Capossela/Axios

AI and automation are receiving a boost during the coronavirus pandemic that in the short term is creating a new hybrid workforce rather than destroying jobs outright.

The big picture: While the forces of automation and AI will eliminate some jobs and create some new ones, the vast majority will remain but be dramatically changed. The challenge for employers will be ensuring workforces are ready for the effects of technology.