The enormous structure, which is made up of gas leaking from the exoplanet's atmosphere, is being blown by stellar winds like a giant "windsock," experts say. The exoplanet, WASP-69 b, is a gas giant.

Windsocks show which way the wind is blowing and how fast it is. Have a go at creating your own colourful windsock with the video below. Emma-Louise: Hi! Let's make a rainbow windsock that blows ...