Place a lamp with a socket inside the moon.
Diy paper mache moon lamp.
Agitate it occasionally to help break up the fibers.
Once dried use a knife to cut out the circle you marked at the beginning and remove the balloon from the shape so that only the paper is left.
Alternately you can put the shredded newspaper in a pot fill with water and boil agitating the mixture to break up the fibers.
I show you.