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Mysterious Streaks of Light Seen in the Sky Friday in California (apnews.com) 40

"Mysterious streaks of light were seen in the sky in the Sacramento area Friday night," reports the Associated Press.

The lights lasted about 40 seconds, remembered one witness who filmed the lights while enjoying a local brewery. The brewery then asked on Instagram if anyone could solve the mystery, the report continues: Jonathan McDowell says he can. McDowell is an astronomer at the Harvard-Smithsonian Center for Astrophysics. McDowell said Saturday in an interview with The Associated Press that he's 99.9% confident the streaks of light were from burning space debris.

McDowell said that a Japanese communications package that relayed information from the International Space Station to a communications satellite and then back to Earth became obsolete in 2017 when the satellite was retired. The equipment, weighing 310 kilograms (683 pounds), was jettisoned from the space station in 2020 because it was taking up valuable space and would burn up completely upon reentry, McDowell added....

He estimated the debris was about 40 miles high, going thousands of miles per hour. The U.S. Space Force confirmed the re-entry path over California for the Inter-Orbit Communication System, and the timing is consistent with what people saw in the sky, he added.

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Mysterious Streaks of Light Seen in the Sky Friday in California

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Every nonzero finite dimensional inner product space has an orthonormal basis. It makes sense, when you don't think about it.

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