global warming definition. The term attached to the notion that the Earth's temperature is increasing due to the greenhouse effect. Note: Whether global warming is actually happening is a subject of scientific debate.
Like jet airplanes, space rockets work on a principle called action and reaction (another name for Newton's third law of motion). The massive force (action) generated by hot gases firing backward from a rocket's engines produces an equal force (reaction) that pushes the rocket forward through space.
Rockets work by accelerating gas to very high speeds inside and then letting the gas escape from the back of the rocket. Sir Isaac Newton discovered that an object can only be accelerated if a force is applied to it. He came up with a simple equation to describe this: