Last night, SpaceX pulled off its final mission of 2017, launching a Falcon 9 rocket out of California’s Vandenberg Air Force Base — and that flight created a spectacular sight in the night sky. The setting sun illuminated the rocket’s expelled gas just right, creating a beautiful white plume above the Earth. But as pretty as the show was, it also led to quite a bit of concern in nearby Los Angeles.

Vandenberg is around 150 miles away from LA, giving the city a front row view of the illuminated rocket:

WOW!!! The view from LA is amazing!!!! People are going to freak out #spacex #IridiumNEXT pic.twitter.com/0mznMRvDKI — Amanda (@alias_amanda) December 23, 2017

That was a beautiful launch, @SpaceX



Now LA, we need to talk. Keep calm, enjoy the pic.twitter.com/vLUbTY1qXw — Bobak Ferdowsi (@tweetsoutloud) December 23, 2017

Big wow. 4K from my Mavic Pro over Alhambra CA of the SpaceX Iridium 4 launch - https://t.co/rpZGqd0NVq - Rocket shows up at 42 seconds. — Doug Ellison (@doug_ellison) December 23, 2017

But many in the City of Angels didn’t exactly know that a rocket launch was happening nearby, leading many to think they had just seen a UFO or that some kind of missile attack was happening. And SpaceX CEO Elon Musk didn’t exactly help matters, joking that the launch was a “Nuclear alien UFO from North Korea.”

#SpaceX gotta give a better Public notice... I aint know if this was a Rocket, aliens, Santa Claus, or North Korea pic.twitter.com/3kbPsTLiJb — JuJu Tha G (@JuJuThaG) December 23, 2017

Since Los Angeles is home to Hollywood, quite a few celebrities also caught a glimpse of the Falcon 9’s climb and took to social media for help.

Wtf Is This pic.twitter.com/vF4fSyRHOG — Jaden Smith (@officialjaden) December 23, 2017

Does anyone know what we just saw in the skies above San Diego? pic.twitter.com/EFNBh87Hc8 — Tony Hawk (@tonyhawk) December 23, 2017

What is that in the Los Angeles sky? pic.twitter.com/15fmC4FgLU — will.i.am (@iamwill) December 23, 2017

The For Your Consideration campaign for I, Tonya is not what I expected. pic.twitter.com/327fmORH3q — billy eichner (@billyeichner) December 23, 2017

To an unsuspecting citizen, such a sight would be pretty terrifying without an explanation. Parts of Los Angeles seemingly received quite a few 911 calls regarding the launch and the Los Angeles Fire Department ended up posting a media advisory. But many space enthusiasts explained to concerned Californians that it was simply SpaceX putting up some satellites, and even the Los Angeles mayor, Eric Garcetti, posted on Twitter to allay people’s fears.

However, one celebrity still believes the truth is out there: