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Loading contentAn accounting of every velocity change a mission requires — launch to orbit, orbital transfers, planetary capture, landing, and margins — summed into a total 'delta-v budget' that the propulsion system must deliver. Comparing the budget against what the rocket equation allows is the central feasibility check of mission design.
Facts on this topic will be cited from these primary and reference sources.
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.