What caused the blue lights in the sky?

Blue Sky: Waves & Light Science Activity

NWS: Mysterious lights in sky likely caused by SpaceX satellite launch

What is the cause of a blue flash of light in the sky? - Quora

Elon Musk's dying rocket is mistaken for an extraterrestrial blue

Russian missile cause of spectacular spiraling blue lights over

Neon blue sky in New York caused by transformer explosion: NYPD

There's an explanation behind the mysterious glow lighting up the

Strange blue lights appear in skies across the world as sightings

What is that string of lights in the night sky?

Starlink satellite trains: What are they and when to see them in

There's an explanation behind the mysterious glow lighting up the

Why Is the Sky Blue? NASA Space Place – NASA Science for Kids