“Anyone else see that UFO in LA just now?”
Startled crowds stopped in their tracks on Friday when the milky white object flew above California on Friday evening.
Some even believed the bizarre sight was proof aliens were about to make first contact.
One tweeted: “WTF was that – first contact?”
Another wrote: “Anyone else see that UFO in LA just now?”
But it quickly became clear aliens were not about to land on Earth.
The stunning phenomenon was actually part of tech giant Elon Musk’s SpaceX Vandenberg launch.
Its mission aimed to send 10 satellites into orbit and the company said it was the fourth flight for long-time customer Iridium.
A crop circle near Raisting, Southern Germany
The rocket was launched from Vandenberg Air Force Base at 5.27pm local time.
All of the satellites were successfully deployed, it was later confirmed.
Musk later poked fun at the baffled crowds when he posted a video of the spectacle on Twitter.
He captioned the clip: “Nuclear alien UFO from North Korea.”