What is the name of the film please?!

What is the name of the film please?

i have no idea who is in it or what it is called,but can only say what it's about,

the film is set in the furture on board a space craft, the crews mission is to destroy dead planets that are in the way that have no life on them.

these use these big rectangle bombs that talk..

Any way they see a plant tell the bomb to go blow it up but at the last minute see a life form or something and have to call off the bombing,
but the bomb is armed and will not stand down, the rest of the film is made of of them talking to the bomb trying to get it to disarm it's self, but in the end the bomb thinks it is god and says "Let they be light" and that is the end of the film.

the reason i ask what is the film called is i would love to own it but before i can look for it i need to know what it's called,

hope someone can help

thank you x kitti x

The film is Dark Star (1974)
Low-budget story of four astronauts in deep space, whose mission is to destroy unstable planets in star systems which are to be colonised. The late Commander Powell is stored in deep freeze, where he is still able to offer advice. As their mission nears completion, they must cope with a runaway alien which resembles a beach-ball, faulty computer systems, and a "smart bomb" who thinks it is God.