So, it’s perfectly logical that Angelenos gazing into a darkening sky around 5:30 p.m. Friday would assume their city was in the midst of an alien invasion as they saw this:

Elon Musk, the billionaire entrepreneur who ultimately wants to put people on a space-bound Megabus, fanned the flames by saying on Twitter that the jellyfish-like shape in the sky was a “nuclear alien UFO from North Korea.”

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Southern Californians and other people out West, well, freaked out.

Jan Brewer, whose Twitter profile succinctly identifies her as “Arizona’s 22nd Governor” tweeted that she was wondering what the lights over Phoenix were. For some reason, she tagged President Donald Trump.

And many, many others pointed their smartphone cameras skyward, capturing what they assumed was the first sign of the alien apocalypse — or something — and musing about the vapory lights in the sky.

There was, of course, a perfectly reasonable explanation.

Musk’s SpaceX had launched an Irdium-4 rocket from Vandenberg Air Force Base in California — about 150 miles from the City of Angels.

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According to the Los Angeles Times, officials had warned that people would be able to see the launch across Southern California and elsewhere on the western half of the country. There was even a live webcast for those with more than a passing interest in rockets.

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The moment a SpaceX rocket launch produced a shining, billowing streak in the sky over California share Share View Photos View Photos Next Image The SpaceX Falcon 9 rocket launches from the Space Launch Complex 4 at Vandenberg Air Force Base in Lompoc, Calif. On its fourth launch toward a $3 billion upgrade to Virginia-based Iridium's mobile, voice and data network, the reused rocket carried 10 satellites into orbit, and left behind a trail of mystery and wonder. (Robyn Beck/AFP/Getty Images)

But for most people, there was just confusion, awe and maybe a little bit of panic.

And as Musk pointed out in the wee hours of Saturday morning, people along the East Coast can freak out next month.

A test launch of that rocket, which Musk hopes will someday lead to missions to Mars, will launch from the Kennedy Space Center in Florida.

This post has been updated.