Mysterious pink cloud in Arizona was Nasa rocket

Last updated at 12:43

People in Arizona, America, got a surprise when they looked up in the sky and saw a big pink cloud!

Residents could see it for about 20 minutes and didn't know what it was...

But they didn't need their eyes checking - the cloud was from a Nasa research rocket.

The rocket released vapours which glowed pink in sunlight.

The vapours were to help study how part of the Earth's atmosphere was formed.