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NASA/JPL-Caltech/UCLA

There is new evidence to support the hypothesis that all stars are "born" with at least one "sibling" — including our sun.

Why it matters: "Our work is a step forward in understanding both how binaries form and also the role that binaries play in early stellar evolution," said UC Berkeley astronomer Steven Stahler.

Two explanations for star pairs:

  1. The two or three stars that are commonly found at the center of planetary systems fall into place together after they form.
  2. The stars at the center of a planetary system are "born" together as "siblings" — this is the favored hypothesis, and the one the new study supports.

The finding: Scientists looked at data from a dust cloud's radio waves in the Perseus constellation that had a host of baby stars. They found that the younger class of stars were closer to their "partners," while some drifted apart as they got older. The scientists then created several simulations of different ways the stars could form. The model that had stars and their twins forming at the same time produced numbers closest to what is observed.

Throwback: Since the 80s, people have speculated that the sun used to have a twin star that shared the center of our universe, even going so far as to name it "Nemesis" and blame it for the extinction of the dinosaurs.

Go deeper

Congress plots COVID pandemic-era office upgrades

oving crates outside Rep. Elise Stefanik's old office Tuesday. Photo: Bill Clark/CQ-Roll Call, Inc via Getty Images

The House plans to renovate members' suites even though staff are worried about an influx of contractors and D.C. is tightening restrictions on large gatherings, some staffers told Axios.

Why it matters: The Capitol has been closed to public tours since March. Work over the holiday season comes as U.S. coronavirus cases spike, Americans beg for more pandemic assistance and food lines grow.

Trump pressures Barr to release so-called Durham report

Bill Barr. Photo: Jabin Botsford/The Washington Post via Getty Images

President Trump and his allies are piling extreme pressure on Attorney General Bill Barr to release a report that Trump believes could hurt perceived Obama-era enemies — and view Barr's designation of John Durham as special counsel as a stall tactic, sources familiar with the conversations tell Axios.

Why it matters: Speculation over Barr's fate grew on Tuesday, with just 49 days remaining in Trump's presidency, after Barr gave an interview to the Associated Press in which he said the Justice Department has not uncovered evidence of widespread fraud that could change the election's outcome.

CDC to cut guidance on quarantine period for coronavirus exposure

A health care worker oversees cars as people arrive to get tested for coronavirus at a testing site in Arlington, Virginia, on Tuesday. Photo: Olivier Douliery/AFP via Getty Images

The CDC will soon shorten its guidance for quarantine periods following exposure to COVID-19, AP reported Tuesday and Axios can confirm.

Why it matters: Quarantine helps prevent the spread of the coronavirus, which can occur before a person knows they're sick or if they're infected without feeling any symptoms. The current recommended period to stay home if exposed to the virus is 14 days. The CDC plans to amend this to 10 days or seven with a negative test, an official told Axios.

  • The CDC did not immediately respond to a request for comment.