This image was generated by using the following prompt:
Prompt: A man is looking at the stars, beautiful night blue sky full of stars.
Negative prompt: (worst quality, low quality, normal quality:1.8).
Use the [Quick Selection Tool] to select the bottom part of the image.
Once selected, press [Control + X] and [Control + Shift + V] to cut and paste in place.
Right click the sky layer, and select [Lighten] as its layer blend mode.
Rotate the image 1 degree, and press [Control + Shift + Alt + T] to duplicate the layer.
After over 100 duplication tries, the image would look like this.
(This is optional, but try placing the bottom layer to the top of the layers list.)
This is the end of the tutorial. 🙂