There is a planet where spirits and angels live. I wouldn't call them aliens or martians. This planet is called Planet Heaven. There is a leader there, a king and his name is God. He has his son Jesus there, along with his friends the saints and children that are called angels. His other children, who's bodies died on a planet called Earth and their spirits floated up to the sky and flew up to Heaven, live with God too.
There is a black hole called Hell. In hell there is also a leader. Devil is his name and sucking the happiness and joy out of spirits is his job. In this black hole there is a cloud of fire. Evil spirits burn in this cloud until they are nothing but black dust. After they become this dust the devil's followers collect the dust, that is still a spirit just in a different form, into a jar. This jar is put on a clear, glass shelf over looking the fire cloud and for eternity the spirits of dust watch other spirits burn and join them on the shelf called "the Devil's pets".