An alien invasion? The Rapture? The sky flashed an eerie blue over New York City on Thursday night and social media users feared the worst.Extraterrestrial activity was a leading theory: “IM SORRY WHAT???? THE SKY JUST TURNED BLUE???? literally so confused I think aliens just tried to steal new york,” one user wrote on Twitter.“Apparently aliens are landing in New York City right now bcs the sky’s blue,” wrote another.In this trying time, some saw the hand of God at work: “Don’t worry, New Yorkers. The blue light you saw in the sky was just the Rapture,” one tweet said.Another Twitter user noted that people had been warned to change their ways: “What’s happening in the sky in New York? If it’s the rapture, I just wanna say I told y’all to quit it.” From Jersey Riverfront pic.twitter.com/WFgWTtoDLH&mdash; NJ Swingsets (@NJSwingsets) December 28, 2018#astoria pic.twitter.com/SxgVK6MYkJ&mdash; Cindi Kinsily (@cindiKINSily) December 28, 2018The power plant by my house in Astoria exploded a little. pic.twitter.com/P26kiTjYdX&mdash; Alexander C. Kane (@alexanderckane) December 28, 2018Why is the sky lit up bright blue in Queens New York City right now? Is it fireworks? #QueensNY #SkyIsBeamingBrightBlue pic.twitter.com/4IF53UUGGG&mdash; Louis Santoro (@Louis_S_Santoro) December 28, 2018What was happening in #Astoria? Sky flickering blue pic.twitter.com/k5efnSr1rS&mdash; Eli Diago Navarro (@elitxudn) December 28, 2018Travelers at LaGuardia airport were treated to potential delays as well as a light show.“Due to a power outage in Queens, there is partial flight operations @LGAairport. Many flights are departing, some are not,” the airport wrote on its Twitter account, later adding that power was back in “all terminals” and advising passengers to check with airlines for flight status information.AFP PHOTO / ANDREW RIOS / TWITTER“The lights you have seen throughout the city appear to have been from a transformer explosion at a Con Ed facility in Queens,” the New York Police Department tweeted. In the end, the explanation turned out to be somewhat more mundane than the end of times or invaders from outer space: a problem at a local power plant.“The lights you have seen throughout the city appear to have been from a transformer explosion at a Con Ed facility in Queens. The fire is under control, will update as more info becomes available,” the New York Police Department tweeted. ADVISORY: The lights you have seen throughout the city appear to have been from a transformer explosion at a Con Ed facility in Queens. The fire is under control, will update as more info becomes available. Follow @fdny, @NYPD114pct and @conedison. pic.twitter.com/fdzQKs1wVV&mdash; NYPD NEWS (@NYPDnews) December 28, 2018Con Edison, the power company, tweeted that: “There was a brief electrical fire at our substation in Astoria which involved some electrical transformers and caused a transmission dip in the area. We’re currently investigating the cause of the incident.” There was a brief electrical fire at our substation on 20th Avenue &amp; 32nd Street in Astoria this evening, which caused a transmission dip in the area. All power lines serving the area are in service and the system is stable. Photo: Michael Friedl, New York Times pic.twitter.com/vq2Ao46rhk&mdash; Con Edison (@ConEdison) December 28, 2018“The incident is under control. There are no injuries reported, and no fire,” the fire department said.The anticlimactic explanation was disappointing to some.“I wish the blue sky in New York was aliens and not a power plant on fire,” one Twitter user wrote.