the technique of using the energy of a gravitational field and the orbital velocity of a planet to change the speed and trajectory of a spacecraft.
noun, Electricity. 1. a cell containing two electrolytes that have different specific gravities. noun 1. an electrolytic cell in which the electrodes lie in two different electrolytes, which are separated into two layers by the difference in their relative densities
- Gravity check
noun phrase A fall from a surfboard, snowboard, etc
noun 1. a clock driven by its own weight as it descends a rack, cord, incline, etc.
noun, Horology. 1. an escapement, used especially in large outdoor clocks, in which the impulse is given to the pendulum by means of a weight falling through a certain distance.