HUNDREDS of Americans called authorities Friday night when Elon Musk’s SpaceX launched its Falcon 9 rocket.

The Los Angeles Fire Department sought to quell any fears among Southern California residents with a statement saying that a “mysterious light in the sky is reported to be as a result of Vandenburg Air Force Base launching [a] rocket to put satellite into space” in Lompoc, California.

Celebrities were among the many in the area who reacted to the view of the rocket which was carrying 10 low-orbit satellites from Iridium Communications.

Stars such as Orlando Bloom, Don Cheadle and Zendaya took to social media to express either concern or excitement.

Bloom, 40, shared a photo of the rocket on Instagram, with the caption in part, “I’m so over excited.”

Meanwhile, Zendaya, 21, wondered what she was seeing. “Wtf is in the sky...,” she wrote on Twitter.

Here’s who else couldn’t get enough of that bright light in the sky:

uh ... — Don Cheadle (@DonCheadle)

What is this in the sky? — will.i.am (@iamwill)

Does anyone know what we just saw in the skies above San Diego? — Tony Hawk (@tonyhawk)

Musk joked about the UFO fears on Twitter, reveling in the chatter.

Nuclear alien UFO from North Korea — Elon Musk (@elonmusk)

Of course, he also took the opportunity to promote his next launch, because what kind of billionaire businessman would he be otherwise.

If you liked tonight’s launch, you will really like Falcon Heavy next month: 3 rocket cores & 3X thrust. 2 cores return to base doing synchronized aerobatics. 3rd lands on droneship. — Elon Musk (@elonmusk)

But more than stoking fears, the launch gave people a chance to fill up their Instagram, Facebook and Twitter accounts.

(SD-Agencies)