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SAN FRANCISCO (KTVU) - The Pentagon says it knows what that fireball was that streaked through the sky late Tuesday night.
Thousands of people reported seeing a white ball of light flying over California, Nevada and Arizona.
Military officials say it was the booster from a Russian rocket that was launched Tuesday.
It broke apart as it passed through the atmosphere.
It attracted a lot of attention on social media, with people saying it was everything from a shooting star to a falling satellite.