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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

It's harder to fill the Cabinet

Data: Chamberlain, 2020, "United States of America Cabinet Appointments Dataset" Chart: Will Chase/Axios

It's harder now for presidents to win Senate confirmation for their Cabinet picks, an Axios data analysis of votes for and against nominees found.

Why it matters: It's not just Neera Tanden. The trend is a product of growing polarization, rougher political discourse and slimming Senate majorities, experts say. It means some of the nation's most vital federal agencies go without a leader and the legislative authority that comes with one.

Exclusive: Hundreds of kids held in Border Patrol stations

Migrants cross the Rio Bravo to get to El Paso, Texas. Photo: Herika Martinez/AFP via Getty Images

More than 700 children who crossed from Mexico into the United States without their parents were in Border Patrol custody as of Sunday, according to an internal Customs and Border Protection document obtained by Axios.

Why it matters: The current backup is yet another sign of a brewing crisis for President Biden — and a worsening dilemma for these vulnerable children. Biden is finding it's easier to talk about preventing warehousing kids at the southern border than solving the problem.

Pompeo plots 2024 power play

Mike Pompeo in Washington on Feb. 12. Photo: Samuel Corum/Getty Images

Mike Pompeo has quickly reentered the political fray, raising money for Republicans, addressing key political gatherings and joining an advocacy group run by Donald Trump's former lawyer.

Why it matters: The former secretary of state is widely considered a potential 2024 presidential contender. His professional moves this week indicate he's working to keep his name in the headlines and bolster a political brand built largely on foreign policies easily contrasted with the Biden White House.