Sir Isaac Newton Sir Isaac Newton (1643-1727), was an English mathematician and physicist, he is considered one of the greatest scientists in history, who made important contributions to many fields of science. His discoveries and theories laid the foundation for much of the progress in science since his time. Newton was one of the inventors of the branch of mathematics called calculus (the other was German mathematician Gottfried Wilhelm Leibniz). He also solved the mysteries …showed first 75 words of 1744 total…

…showed last 75 words of 1744 total…for jets to suck or for propellers to churn, and yet space ships can maneuver in a vacuum. How do they do it? The engines propel gas particles out the back of the space ship. Since every force has an equal and opposite reaction force, the space ship will be propelled forwards. Because of the First Law, space ships do not need very much fuel - once they are moving they will stay in motion