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.
Top 10 facts about the world. Conventional rockets create thrust by combining liquid fuel with an oxidizer, usually liquid oxygen. Both the fuel and the oxidizer take up a lot of space, resulting in rockets that must be very large to achieve the thrust necessary to launch a satellite into orbit. For example, 8 grams of oxygen is necessary to ignite 1 gram of hydrogen, a typical rocket fuel.