When we fired a bullet from our rifle, we will feel a repulsion backwards. It happens everywhere, whether on Earth or in a vacuum of space. This concept is used by spacecraft to reduce the speed of the aircraft and make the plane bend toward Earth.
For more details, assume an airplane is orbiting the Earth at an altitude. The aircraft will feel two styles. The first centrifugal force that moves away from Earth and depends on the speed of the aircraft. The second force is the gravitational force of the Earth that goes towards Earth. In this orbit both forces are balanced (astronauts can float in the plane).
When the plane splashes gas in the opposite direction in the direction of speed, repulsion due to this burst will reduce the speed of the plane. The smaller the aircraft speed the smaller the centrifugal force. Now the gravitational force of the Earth is more dominant, consequently the plane will be drawn close to Earth in spiral form.
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