India, March 25 -- On Monday, a giant glowing spiral appeared in the night sky over parts of the UK, leaving onlookers starstruck.

The mesmerizing yet mysterious swirl, visible for several minutes before fading, is believed to have been caused by leftover fuel from Elon Musk's SpaceX rocket launched thousands of miles away in the US.

The Falcon 9 rocket, operated by Musk's space company, lifted off from Florida's Kennedy Space Center around 13:50 local time (17:50 GMT) as part of a classified US government mission.

Falcon 9 is a reusable rocket, meaning that after deploying its payload-such as a satellite-it begins its return journey to Earth. During this process, any remaining fuel is jettisoned into space. Due to the extreme altitude...