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.
In a nutshell, a rocket must curve its trajectory post-launch, if it wants to enter the Earthâs orbit. If it didnât do that and continued to go straight up, it would eventually reach a point where its fuel would run out and, most likely, it would end up plummeting back to Earth like a stone. 1  Human Space Flight â NASA. 2  NASA SpacePlace. 3  Wikipedia. 4  NASA â Space Flight Systems.