Jun 12, 2017

New theory for how the Moon was formed

Nick Ut / AP

A new theory of how the Moon was formed, published in Scientific American:

Earth collided with another planet, vaporizing the outer layers and forming a continuous body of material called a synestia.This likely happened several times in Earth's history, but in one case, as it condensed, the Moon was formed.Why it matters, per author Simon Lock: "The discovery of synestias is a game changer for our understanding of how the Earth formed. It is likely that several times during formation, the body that would become the Earth was transformed into an extended, substantially vaporized body. This dictates how the core of the Earth formed, how we acquired our ocean and atmosphere, and maybe how our planetary companion, the Moon, came into being."

Current theory: A Mars-sized planet called Theia slowly bumped up against Earth, knocking off material that formed into a disk of molten rock around our planet. But more recently, researchers found that the speed of rotation for the Earth and Moon could have been much greater when they first formed and scientists began to study how else the Moon may have been created. Lock says synestias come in many shapes and sizes and could change our understanding of how planet formation beyond our solar system.

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U.S. coronavirus updates: Death toll tops 4,000

Data: The Center for Systems Science and Engineering at Johns Hopkins; Map: Andrew Witherspoon/Axios

The novel coronavirus has now killed more than 4,000 people in the U.S. — with over 1,000 deaths reported in New York City, per Johns Hopkins.

The state of play: President Trump said Tuesday it's "going to be a very painful two weeks," with projections indicating the virus could kill 100,000–240,000 Americans — even with strict social distancing guidelines in place.

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Coronavirus dashboard

Illustration: Sarah Grillo/Axios

  1. Global: Total confirmed cases as of 3 a.m. ET: 860,181 — Total deaths: 42,354 — Total recoveries: 178,359.
  2. U.S.: Leads the world in confirmed cases. Total confirmed cases as of 3 a.m. ET: 189,633 — Total deaths: 4,081 — Total recoveries: 7,136.
  3. Business updates: Should you pay your rent or mortgage during the coronavirus pandemic? Find out if you are protected under the CARES Act.
  4. Public health updates: More than 400 long-term care facilities across the U.S. report patients with coronavirus — Older adults and people with underlying health conditions are more at risk, new data shows.
  5. Federal government latest: President Trump said the next two weeks would be "very painful," with projections indicating the virus could kill 100,000–240,000 Americans.
  6. Coronavirus in custody: Inmates in all U.S. federal prisons are set to enter a 14-day quarantine on April 1. A federal judge on Tuesday ordered U.S. Immigration and Customs Enforcement to release 10 detained immigrants who are at risk from COVID-19.
  7. U.S.S. Theodore Roosevelt: Captain of nuclear aircraft carrier docked in Guam pleaded with the U.S. Navy for more resources after more than 100 members of his crew tested positive.
  8. What should I do? Answers about the virus from Axios expertsWhat to know about social distancingQ&A: Minimizing your coronavirus risk.
  9. Other resources: CDC on how to avoid the virus, what to do if you get it.

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World coronavirus updates: UN warns of recession with "no parallel" to recent past

Data: The Center for Systems Science and Engineering at Johns Hopkins, the CDC, and China's Health Ministry. Note: China numbers are for the mainland only and U.S. numbers include repatriated citizens and confirmed plus presumptive cases from the CDC

The novel coronavirus pandemic is the "greatest test" the world has faced together since the formation of the United Nations just after the Second World War ended in 1945, UN chief António Guterres said Tuesday.

The big picture: COVID-19 cases surged past 859,000 and the death toll exceeded 42,000 early Wednesday, per Johns Hopkins data. Italy reported more than 12,000 deaths.

Go deeperArrowUpdated 2 hours ago - Health