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A pair of spectacular images of an ethereal spiral in the night sky may show the upper stage of a SpaceX Falcon 9 rocket after it launched a secret satellite for the U.S. government on Sunday night (Jan. 7).

The photos, posted on Twitter, show a brilliant spiral that appeared in the night sky shortly after a SpaceX Falcon 9 rocket launched the Zuma satellite on a mystery mission for the U.S. government. Some media reports, citing anonymous government officials, have reported that the Northrop Grumman-built Zuma spacecraft may have failed after it launched into orbit. SpaceX representatives have said their Falcon 9 rocket performed as expected during the Zuma launch. A Northrop Grumman representative said the company cannot comment on the mission due to its classified nature.

One photo, taken by Dutch pilot Peter Horstink, shows a dazzling aerial view of an object in the sky, taken as Horstink flew on a freighter aircraft. The object appears as a greenish-blue spiral, seen as Horstink flew 35,000 feet (11,000 meters) above the Earth's surface near the city of Khartoum, Sudan, according to veteran satellite tracker Marco Langbroek, who posted the photo on Twitter.

Another photo in Sudan, taken by Sam Cornwell, shows a view of the spiral from the ground. 

Langbroek said both photos show what appears to be a normal venting of excess fuel by the upper stage of the SpaceX's Falcon 9 rocket after separating from its payload. Such venting procedures are typical after launches, done to avoid explosions after spacecraft separation, Langbroek wrote on his satellite-tracking website.

SpaceX launched the secret Zuma spacecraft on Sunday night from the company's Space Launch Complex 40 pad at Cape Canaveral Air Force Station in Florida. The spacecraft was built by Northrop Grumman for a U.S. government agency, but which agency that is has not yet been revealed.

The mission was SpaceX's first launch of 2018 and the company's third classified launch for the U.S. government. In May 2017, SpaceX launched a classified spy satellite for the U.S. National Reconnaissance Office, following that in September with the launch of an X-37B robotic space plane on a secret mission for the U.S. Air Force. The X-37B space plane is still in orbit on its classified OTV-5 mission. 

Email Tariq Malik at tmalik@space.com or follow him @tariqjmalik and Google+. Follow us @Spacedotcom, Facebook and Google+. Original article on Space.com.