Answer: I'm not going to write your whole essay for you, but some good reasons to use would be: A change in atmosphere, they can experience what life is like on a different planet, they can get a chance to learn more about mars or anything else about space, and they can compare and contrast how different mars is from earth along with make new memories on a different planet.
Explanation:
George Orwell was using concept of a sudden motion by describing the instant of pulling the trigger ''When I pulled the trigger I did not hear the bang..'' and because he is describing that he did not hear ''the bang'' when he did that, it explains that it was easy thing for him to pull the trigger or hurt someone.
He is using also a sense of imagery when he is describing his deed.
