The sun and the moon

This is about a girl and a boy and they are twins. They love to see the sun and the moon. they soon die and become the sun and moon the girl is the sun and the boy is the moon and they have a job witch is to swap places every day of their lives if not they will make the world crazy if they do then the world will be normal but a galaxy like being try's to find a human to take his place of a galaxy and finds a spoiled boy who fakes loving the galaxy and becomes the galaxy and traps the first galaxy like being.