What kind of disagreement did mary jackson and john becker have 

Mary Jackson prepared an assignment but John Becker was not ready to approve the result of the assignment which led to the disagreement between them.

It became evident later that John Becker had the wrong input data which made him the wrong party in the disagreement. This is a good example of standing up for yourself when you are completely sure that you are right. 

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elon musk, ceo of spacex, a startup space company is planning to head to mars by 2023. nasa is planning to go to mars at around 2025. both are just for a basic colony.