Odd spiral appears amid northern lights in Alaska night sky

It created a bit of an Internet storm with that spiral, Hampton said.Photographers out for the northern lights show also posted their photos on social media.The rocket that took off from Vandenberg Space Force Base in California Friday night about 25 satellites as its payload.It was a polar launch, which made it visible over a large swath of Alaska.The timing was right they had done a some sort of fuel dump at that time, and we got that really cool looking spiral thing, he said.

Northern light enthusiasts got a surprise mixed in with the green bands of light dancing in the Alaska skies: A light baby blue spiral resembling a galaxy appeared amid the aurora for a few minutes. The cause early Saturday morning was a little more mundane than an alien invasion or the appearance of a portal to the far reaches of the universe. It was simply excess fuel that had been released from a SpaceX rocket that launched from California about three hours before the spiral appeared.

Sometimes rockets have fuel that needs to be jettisoned, said space physicist Don Hampton, a research associate professor at the University of Alaska Fairbanks Geophysical Institute.

"When they do that at high altitudes, that fuel turns into ice," he said. "And if it happens to be in the sunlight, when you're in the darkness on the ground, you can see it as a sort of big cloud, and sometimes it's swirly." While not a common sight, Hampton said he's seen such occurrences about three times.

The appearance of the swirl was caught in time-lapse on the Geophysical Institute's all-sky camera and shared widely. "It created a bit of an Internet storm with that spiral," Hampton said.

Photographers out for the northern lights show also posted their photos on social media.

The rocket that took off from Vandenberg Space Force Base in California Friday night about 25 satellites as its payload.

It was a polar launch, which made it visible over a large swath of Alaska.

"The timing was right they had done a some sort of fuel dump at that time, and we got that really cool looking spiral thing," he said. And while it looked like a galaxy going over Alaska, he assures it wasn't.

"I can tell you it's not a galaxy," he said. "It's just water vapour reflecting sunlight."

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