Earth or Planetary travel advancement will be achieved when Airplanes or Space Rockets/Starships will take off lightly and unnoticed that can happen only when an alternative source of energy is discovered, brought in, or put in a use safely like Nuclear. Can't wait to witness that feeling when heavy bodies takes-of quietly and balanced, followed achieve an unmatched controllable speed then join other units or land perfectly and quietly.
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From @rriachi