Illustration: Rebecca Zisser / Axios

Physicists today reported observing waves in space and time from the collision of two black holes 1.8 billion light years away. It's the fourth time in two years these ripples formed from black hole mergers have been spotted, but this time they were able to more precisely locate where the collision took place in our universe.

Why it matters: It demonstrates that three detectors — two are nearly aligned and one is not — can be used to track these events in three dimensions. Ultimately, physicists want to combine observations from these detectors with those from optical telescopes to both "see" and "hear" events like neutron stars colliding, which could explain the origins of heavy elements, and test Einstein's general theory of relativity.

What they saw: On August 14, the Laser Interferometer Gravitational-Observatory (LIGO) detectors in Washington and Louisiana along with the Virgo detector in Italy observed waves from two black holes (one 31 times the mass of the Sun and the other 25 times the mass) combining to form one 53 times larger in mass than the Sun.

They also analyzed how the gravitational waves distorted space and time. What they saw was consistent with Einstein's prediction that they would "stretch and squeeze spacetime in the plane perpendicular to their direction of travel."

Sound smart: The sum of the two colliding black holes was three solar masses more than the black hole that formed, meaning the mass of three Suns was converted into the energy of the gravitational waves.

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Coronavirus dashboard

Illustration: Sarah Grillo/Axios

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Scoop: Don Jr. plans convention-week Biden book

Cover via Don Jr.

Donald Trump Jr., in quarantine since girlfriend Kimberly Guilfoyle tested positive for the coronavirus, says he's used the time to finish a book that he'll self-publish the week of the Republican convention, at the end of August.

What he's saying: Don Jr., whose controversial blasts connect with President Trump's base, told me in a phone interview that "Liberal Privilege" will be his effort to paint a picture of Joe Biden and his record that the press ignores.

Romney calls Stone commutation "historic corruption"

Sen. Mitt Romney. Photo: Tom Williams/CQ-Roll Call, Inc via Getty Images

Sen. Mitt Romney (R-Utah) on Saturday tweeted a scathing response to President Trump's Friday night commutation of former associate Roger Stone's prison sentence, calling the move "[u]nprecedented, historic corruption."

Why it matters: Romney has emerged as the party's most prominent Trump critic. He sent shockwaves through Washington after announcing he would vote to convict Trump in the impeachment trial — becoming the only Senate Republican to break ranks and vote for the president's removal from office. Now he is the first major GOP lawmaker to condemn Trump's Friday night call regarding Stone.