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.
Answer Wiki. To get to an approximately circular low earth orbit and stay there, a rocket needs to accelerate whatever vehicle it is delivering into space up to about 8 km per second relative to the earth. Of course, the rocket starts at a speed of 0 (right at liftoff) and accelerates rapidly to reach that speed, discarding stages along the way.