None of the orbits of the planets or the space ships follow realistic path. One of the authors mentioned that they didn't calculate the positions of the planets or the trajectories between them. So the Expanse isn't as realistic as 2001 or the Martian where the orbital mechanics play a key role in the story.None of the orbits of the planets or the space ships follow realistic path. One of the authors mentioned that they didn't calculate the positions of the planets or the trajectories between them. So the Expanse isn't as realistic as 2001 or the Martian where the orbital mechanicsorbital mechanicsIsaac Newton published more general laws of celestial motion in the first edition of Philosophiæ Naturalis Principia Mathematica (1687), which gave a method for finding the orbit of a body following a parabolic path from three observations.https://en.wikipedia.org › wiki › Orbital_mechanicsOrbital mechanics - Wikipedia play a key role in the story.