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What type of sky is this?

Hello,

I’m new to Unreal. I’m currently checking tons of tutorials.

Does anyone know what is the sky used on the below link (minute 28:59 to 29:03 he jumps from nothing to a nice sky)?
Is it a sphere with a material with emission?

https://www.youtube.com/watch?v=ATX7kmET4zE

Thank you!