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Kepler 90 is the first known 8-planet system outside of our own. In this system, planets orbit closer to their star, and Kepler 90i orbits once every 14 days. Image: Google

A Google machine learning algorithm found two new planets in previously studied data from NASA's Kepler Space Telescope.

The details:

  • Kepler-90i is the eighth planet to be found in the Kepler-90 system, which is 2,545 light years away from Earth. “This discovery ties Kepler-90 with our own solar system for having the most known planets," according to NASA's Paul Hertz, who spoke in a press conference.
  • The rocky planet is about 30% larger than Earth, likely has an average temperature of about 800°F, and orbits its star every 14.4 days. All of the known planets in the Kepler-90 system are closer to their star than Earth is to the Sun, says astronomer and co-discoverer Andrew Vanderburg from the University of Texas at Austin.
  • A second Earth-sized planet, Kepler-80g, was also spotted.
  • Exoplanets can be found by looking for a change in a star's brightness as a planet passes in front of it. The AI — a neural network — learned to identify planets from 15,000 Kepler signals that had already been labeled by scientists. When the AI then looked at data from 670 stars, it found the two planets.

What's next: They hope to study Kepler's data from more than 150,000 stars to see if they can spot weak signals researchers missed.

Go deeper

Teachers across the U.S. protest laws restricting racism lessons

Thousands of teachers and other educators held protests across the U.S. Saturday against the actions of "at least 15 Republican-led states" that aim to restrict teaching about racism in class, the Washington Post reports.

Driving the news: There were demonstrations in at least 22 cities for the "Day of Action" to raise awareness about moves to limit students' exposure to critical race theory, which links racial discrimination to the nation's foundations and legal system, per Axios' Russell Contreras.

Updated 5 hours ago - Health

Lawsuit challenging Houston Methodist's COVID vaccine mandate dismissed

Houston Methodist Hospital in Houston, Texas. Photo: Brandon Bell/Getty Images

A federal judge on Saturday dismissed a lawsuit brought by 117 Houston Methodist staff over the hospital's policy requiring all employees to be vaccinated against COVID-19.

Why it matters: This is the first federal court ruling on a coronavirus vaccine mandate. Attorney Jared Woodfill, representing the plaintiffs, told KHOU 11 it's "the first battle in a long fight," as he vowed to file another lawsuit soon.

G7 leaders to announce plan to phase out gasoline cars

British Prime Minister Boris Johnson talks next to President Joe Biden and French President Emmanuel Macron at the G7 summit in Carbis Bay, Cornwall, England, on Saturday. Photo: Leon Neal/Getty Images

G7 leaders are set to announce Sunday a range of measures to tackle climate change, including "ending almost all direct government support" for fossil fuels and phasing out gasoline and diesel cars.

Driving the news: The plan was outlined in a British government announcement Saturday, which states that the leaders will also agree to halting "all unabated coal as soon as possible."