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The map of cosmic history. Image: Anand Raichoor (EPFL), Ashley Ross (Ohio State University) and the SDSS Collaboration

A new, sweeping analysis fills in 11 billion years of the history of our universe in unprecedented detail.

The big picture: Previous studies have illuminated the very earliest days of the universe and others have detailed the cosmos' more recent history, but until now, there's been an 11 billion year gap in knowledge of our roughly 13.8 billion year old universe.

Details: A collaboration — called the extended Baryon Oscillation Spectroscopic Survey (eBOSS) — collected data about 2 million galaxies and quasars.

  • That information, which traces the 11 billion year gap, was combined into a map with other data that pieces together the expansion history of the universe from just 300,000 years after the Big Bang to now.
  • It took about 10 years for the astronomers working on eBOSS to gather enough data to come out with these results.
  • "What makes this so difficult is simply that the volume is so large, the signals we are seeking are so weak, and the galaxies are so faint," Kyle Dawson, eBOSS principal investigator, told me via email. "Even with an advanced instrument such as the BOSS spectrograph, it took us a decade to observe enough faint galaxies and quasars to make the measurements that we are reporting today."

The intrigue: The new analysis further complicates measurements of the rate of the expansion of the universe — a value known as the Hubble constant.

  • The eBOSS map suggests that the expansion rate — thought to be spurred on by dark energy — is actually about 10% lower than the rate found when measuring the distances to other galaxies using different means.
  • That number closely hews to others that are in line with the standard model of cosmology, but other means of measuring the Hubble constant have diverged in recent years, complicating that picture.

Go deeper

Miriam Kramer, author of Space
Sep 2, 2020 - Science

A new type of black hole

Illustration: Eniola Odetunde/Axios

Scientists announced Wednesday the first surefire evidence of a never-before-seen type of black hole in deep space.

Why it matters: Intermediate-mass black holes could be key to understanding how black holes and galaxies form.

45 mins ago - World

Taiwan leader confirms U.S. troops on island training forces

Taiwan's President Tsai Ing-wen in Taipei earlier this month. Photo: I-Hwa Cheng/Bloomberg via Getty Images

Taiwan's President Tsai Ing-wen told CNN Thursday that a small number of American troops are on the island for training purposes and she has "faith" the U.S. would defend the democracy against a Chinese military attack.

Why it matters: This is the first time a Taiwanese leader has publicly acknowledged the presence of U.S. troops on the self-governing island since the last U.S. garrison left in 1979, when Washington switched formal diplomatic recognition to Beijing.

Updated 4 hours ago - Health

NYC firefighters union urges members to defy mayor's vaccine mandate

New York City Mayor Bill de Blasio. Photo: Michael M. Santiago/Getty Images

The president of New York City's firefighters union told reporters Wednesday that he's advised unvaccinated members to ignore Mayor Bill de Blasio's COVID-19 vaccine mandate for city workers, per Reuters.

Why it matters: Under de Blasio's order that's due to take effect Friday, unvaccinated city employees would be placed on unpaid leave. But Uniformed Firefighters Association head Andrew Ansbro said he told members that "if they choose to remain unvaccinated, they must still report for duty," according to Reuters.