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What was that bright object flying through the Bay Area sky?

Onlookers took to social media to post pictures and videos of the unknown object that was spotted at around 9 p.m. Everyone was asking the same questions: What was is? Was it a meteor? A shooting star? UFO?

At first, there were only theories as to what it might be. But one theory, that has now been confirmed by the U.S. Strategic Command, basically calls it “space junk.”

“It’s from a Chinese rocket, called the Chang Zheng 7 rocket that launched on June 25,” said Jonathan McDowell, an astronomer at the Harvard-Smithsonian Center for Astrophysics.

U.S. Strategic Command spokeswoman Julie Ziegenhorn tells The Associated Press the Chinese CZ-7 rocket re-entered the atmosphere around 11:36 p.m. Central time. That’s about the same time social media lit up with reports from Nevada, Utah and California of a small fireball streaking across the sky.

Confirmed by @SpaceTrackOrg @JointSpaceOps that the CZ-7 rocket, object 41628, reentered 0436 UTC over 119W 37N heading E over Nevada, Utah

– Jonathan McDowell (@planet4589) July 28, 2016

Ziegenhorn wouldn’t say if the rocket ever posed danger to people on the ground. She says the command often sees re-entries.