Johan Hidding / Flickr

We know how much total matter is in the universe, including "normal" matter (things like stars, planets, you, me) and more mysterious "dark" matter. However, only about 10% of the normal matter has been accounted for in surveys of galaxies. Astronomers have long suspected the missing matter sits in threads of gas between galaxies, but it's hard to detect because it's very tenuous.

What's new: Researchers now report spotting about 30% of the missing matter by looking for its shadow in the cosmic microwave background — the afterglow of the big bang itself. The background light filters through the gas and gets bumped up to higher energies through collisions with the hot particles, leading to a subtly higher observed temperature between galaxies.

Why it matters: While it doesn't completely solve the mystery of the missing matter, the research may help us paint a fuller family portrait of the universe. By understanding what it's made of, we can learn more about its past and future evolution.

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Updated 56 mins ago - Technology

Trump agrees to TikTok deal

Illustration: Sarah Grillo/Axios

President Trump on Saturday said he approved "in concept" a deal whereby TikTok will be allowed to continue operating in the U.S., with Oracle as its "trusted technology partner."

Why it matters: TikTok has nearly 100 million U.S. users, and is still growing fast. Trump has threatened to ban it, due to data privacy concerns related to TikTok's ownership by Chinese tech company.

Updated 1 hour ago - Politics & Policy

Trump says Supreme Court nominee "will be a woman"

President Trump speaking prior to his departure from the White House on Sept. 19. Photo: Sarah Silbiger/Getty Images

President Trump said during a Fayetteville, North Carolina, rally Saturday he'll announce a nominee for Justice Ruth Bader Ginsburg's vacant Supreme Court seat "next week" and "it will be a woman."

Details: Trump told reporters earlier, "The choice of a woman, I would say, would certainly be appropriate."

Updated 3 hours ago - Politics & Policy

Coronavirus dashboard

Illustration: Sarah Grillo/Axios

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  2. U.S.: Total confirmed cases as of 6:15 p.m. ET: 6,756,781 — Total deaths: 199,090 — Total recoveries: 2,556,465 — Total tests: 93,150,052Map.
  3. Politics: In reversal, CDC again recommends coronavirus testing for asymptomatic people.
  4. Health: The dwindling chances of eliminating COVID-19.
  5. World: Guatemalan president tests positive for COVID-19 — The countries painting their pandemic recoveries green.