What is the rocket engine?

A rocket engine is a type of propulsion system that generates thrust by expelling mass at high speed, enabling spacecraft to overcome Earth's gravity and travel through space. It typically operates on the principle of Newton's third law of motion, where the force of the expelled exhaust propels the rocket in the opposite direction. Rocket engines can be classified into two main types: liquid propulsion, which uses liquid fuel and oxidizer, and solid propulsion, which relies on solid propellant. They are essential for launching satellites, crewed missions, and deep space exploration.