Using a background for another project of mine after messing around with a paint dot I added some noise, it looked like a planet so after messing with the brightness and contrast along with opacity and levels. So I started altering the Hue and saturation, thinking it looked vast but rather empty I added a shooting star.
By adding a paint drop then getting the smudge tool and smudging a tail then changing the blending option to hard light and giving it a outer glow and changing the colour to off white/yellow, I have a shooting star and added it in.