The bright streaks of light were spotted around 1:30 a.m. Tuesday. Users online reported seeing it across the region, from Temecula, Orange County, Los Angeles and beyond.
Many took to social media to get answers about the origin of the lights.
Find our latest updates on the celestial light show here | Streaking lights that lit up SoCal night sky were caused by Chinese space junk reentry, experts say
Some speculated it was a possible meteor or comet, while others thought it could be debris from the SpaceX Falcon 9 rocket that took off from Vandenberg Space Force Base around 7:30 p.m. Monday.
Did you see it? SpaceX Falcon 9 rocket launches from SoCal coast
The Aerospace Corporation, an independent non-profit corporation that's federally funded, does space research and has information on its website about a Chinese spacecraft that was predicted to re-enter the planet's atmosphere near L.A. around the time the lights were spotted.
NASA's Jet Propulsion Laboratory has a breakdown of celestial events happening this month - such as easy-to-spot planets, an eclipse and a comet that is viewable with binoculars - but nothing to answer the mystery.
Eyewitness News reached out to SpaceX, The Aerospace Corporation NASA and JPL regarding the incident but has not heard back.