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Look up. Is it a bird? A plane? Aliens?

It's definitely not aliens, but SpaceX CEO Elon Musk is trolling concerned Los Angeles residents and celebrities who noticed something eerie in the early evening sky Friday.

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Many assumed the strange shape and smoke were from an alien spaceship or a UFO.

But relax, it was a planned launch from the nearby Vandenberg Air Force Base. At 5:27 p.m., the Iridium-4 satellite was launched as part of a series to form the Iridium NEXT satellite constellation.

SpaceX is launching 75 of 81 new Iridium satellites that will be part of the low-Earth orbit network. The satellites are set to deploy about an hour after launch.

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Even singer will.i.am and actor Don Cheadle freaked out about the mysterious object.

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Pro-skateboarder Tony Hawk down in San Diego stopped to wonder what was flying above him.

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Elon Musk took the opportunity to troll some people on Twitter.

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LA Mayor Eric Garcetti tried to calm people down ...

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... but they kept freaking out anyway.

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LA, city of angels -- and aliens.

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TopicsSpaceX