May 12, 2017

How a musical rhythm keeps 7 planets in orbit

L. Calçada/ESO /AP

To understand how seven tightly-packed Earth-sized planets orbit around their star (Trappist-1) without colliding or falling into space, scientists turned their orbits into musical notes.

How: Astronomers found that the planets are in a resonant orbit and can continue as such for billions of years. The rhythmic pattern inspired astrophysicist and musician Matt Russo to assign each of them a musical note based on their orbital period, and the result was something similar to a drum progression.

What's next? Though Trappist-1 is the only known planetary system whose planets orbit in resonance, this research could lead to a better understanding of how planets form and exist around other dwarf stars.

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Police officer in George Floyd killing arrested

A protester with a sign with George Floyd's last words. Photo: Stephen Maturen/Getty Images

Derek Chauvin, the Minneapolis police officer involved in the killing of George Floyd, was taken into custody Friday by Minnesota's Bureau of Criminal Apprehension, according to the Star Tribune's Briana Bierschbach.

The state of play: Minnesota Department of Public Safety Commissioner John Harrington said that there was no additional charging information yet, as that decision is in the jurisdiction of the Hennepin County Attorney's Office.

This is a breaking news story and will be updated.

Trump forces fateful choices on Twitter and Facebook

Illustration: Sarah Grillo/Axios

President Trump's war with Twitter is confronting social media platforms with a hard dilemma: whether to take fuller responsibility for what people say on their services, or to step back and assume a more quasi-governmental role.

The big picture: Facebook is trying to be more like a government committing to impartiality and protecting free speech and building mechanisms for arbitration. Twitter, pushed by Trump's inflammatory messages, is opting to more aggressively enforce conduct rules on its private property, like a mall owner enforcing rules inside the gates.

Updated 37 mins ago - Politics & Policy

Coronavirus dashboard

Illustration: Sarah Grillo/Axios

  1. Global: Total confirmed cases as of 1 p.m. ET: 5,851,494 — Total deaths: 362,238 — Total recoveries — 2,445,181Map.
  2. U.S.: Total confirmed cases as of 1 p.m. ET: 1,729,185 — Total deaths: 101,706 — Total recoveries: 399,991 — Total tested: 15,646,041Map.
  3. 2020: North Carolina asks RNC if convention will honor Trump's wish for no masks or social distancing.
  4. Public health: Hydroxychloroquine prescription fills exploded in March —How the U.S. might distribute a vaccine.
  5. Transportation: National mobility keeps rising as more states reopen economies.
  6. 🎧 Podcast: Saying goodbye to U.S. megacities.