The phrase "orbit changes" refers to a shift or alteration in the path or trajectory of an object, typically a planet or satellite, as it revolves around another celestial body. Full definition
Sharma worked out how the speed of circular orbits changed with distance from the galactic centre (called the rotation curve). (sciencedaily.com)
In astronomical jargon, the process by which long, oval orbits change into close orbits is called «high - eccentricity migration». (sciencedaily.com)
«The study demonstrates how making measurements of planetary orbit changes throughout the solar system opens the possibility of future discoveries about the nature of the Sun and planets, and indeed, about the basic workings of the universe,» said co-author Maria Zuber, vice president for research at MIT. (sciencedaily.com)