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Phobos
#4
Oct15-03, 09:03 AM
Emeritus
Sci Advisor
PF Gold
P: 2,020
Gravity of planets

Gravity dictates the orbits of the planets around the sun (and as Janus said, the moons around the planets). By measuring those orbits, you can calculate the planet's gravity. See the link I provided in the other topic you started.