Reading: Develop the model
A controlled gravity-field comparison
In the Gravity Field Explorer, hold the central body and test mass fixed. Increase altitude and record radial distance, field strength g, and force on the test mass. Compare force ratios for two different radial distances and check the result against (r₁/r₂)². Do not confuse the force value in newtons with acceleration in m/s².
A controlled orbit comparison
In the Orbital Studio, select a central body model, then vary only altitude. Record radius measured from the center, circular speed, gravitational acceleration and period. Earth and Moon use different gravitational parameters and radii; comparing their altitude fields requires stating both body differences, not treating altitude as the only changed variable.
Use accessible synthetic data
The CSVs supply precomputed examples for students who cannot use slider controls or SVG diagrams. Values are rounded so slight differences from full-precision calculations are expected. Students should note how rounded constants and significant figures affect reported numerical precision.
Safety and model scope
This laboratory requires no rockets, live objects, launching or dropping equipment. A simplified circle model is not an orbital flight planner. Scientific data here are generated algebraically without live telemetry, telescope observation or real spacecraft tracking. Document what was calculated and identify a real-world effect absent from the model.