Is it a bird? Is it a plane?
Not quite, says the Met Office.
This large glowing spiral was spotted in the night sky across the UK and Ireland on Monday evening.
The swirl above Castleford in West Yorkshire. Pic: Jake Gill
Stargazers from as far north as Denmark and as far south as Milan in Italy noted the cloud-like spiral was visible for several minutes before fading.
The Met Office explained in a post on X that the phenomenon was likely caused by frozen exhaust smoke from Elon Musk‘s SpaceX Falcon 9 rocket.
“The rocket’s frozen exhaust plume appears to be spinning in the atmosphere and reflecting the sunlight, causing it to appear as a spiral in the sky,” the Met Office said.
These spirals form when ejected rocket fuel from the fast-spinning upper stages of the Falcon 9 gets frozen in space instantly because of the altitude.
The frozen swirls then reflect sunlight back towards Earth, which makes them visible in the night sky.
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