2023-11-27 02:57:27
Rockets only need to use their engines to reach orbital velocity, not maintain altitude. Once in orbit, an object will coast without further propulsion. [Link] NEEDS_MORE_RATINGS(0-0-0) Author
2023-11-27 03:48:31
Propulsion is normally required to keep altitude of heavier-than-air craft. However, once an object goes fast enough and reaches the so-called escape velocity this no longer holds. There are special trajectories (called orbits) that can keep objects "suspended" indefinitely [Link][Link] NEEDS_MORE_RATINGS(0-0-0) Author