@astro_physiccs: Rockets fly when fuel combustion produces enough thrust to propel them upward. The amount of rocket fuel burned and how fast it escapes out of the rocket determines the amount of thrust produced. Lift off only occurs if the thrust is larger than the gravitational force. #universe #space #star #science #knowledge #physics #earth #mattroi #traidat #xuhuong #sun #khonggian #astronomia #forpage #vutru #vatly #kienthuc #rocket