{"knowledge_schema": {"broad_category": "Astronomy \u2192 Exoplanet Studies \u2192 Radial Velocity Method", "refinement": "This problem involves analyzing the relationship between the mass of exoplanets, their orbital periods, and the observed radial velocity shifts of spectral lines.", "specific_scope": "The focus is on comparing the orbital periods of two exoplanets based on the periodic shifts in spectral lines caused by their gravitational influence on their host stars.", "goal": "Determine the ratio of the orbital periods of Planet B to Planet A based on the observed radial velocity shifts."}, "summary": "This problem is rooted in astronomy, specifically in the study of exoplanets using the radial velocity method. It examines how the observed shifts in spectral lines relate to the masses of the planets and their orbital periods. By analyzing the periodic shifts of 5 milliangstroms for Planet A and 7 milliangstroms for Planet B, the goal is to calculate how many times the orbital period of Planet B is longer than that of Planet A. The answer indicates that Planet B's orbital period is 0.36 times that of Planet A."}