Earth Exploding

Um... I wanna make a comic about a boy Ketaro Yamamoto. The story is that a missle lauched into the earth 40 years ago makes the earth start to explode, but during the evacuation to Mars, They decide the sick and injured cannot come and have to be left behind. The thing is that Ketaro broke his arm and is hasn't healed yet, so he is being left behind. Now he has to find a way off before the destruction of his home. Please Comment!