Editing Geophysics (section)

===Satellites and space probes===
Satellites in space have made it possible to collect data from not only the visible light region, but in other areas of the [[electromagnetic spectrum]]. The planets can be characterized by their force fields: gravity and their [[magnetic field]]s, which are studied through geophysics and space physics.

Measuring the changes in acceleration experienced by spacecraft as they orbit has allowed fine details of the [[gravity field]]s of the planets to be mapped. For example, in the 1970s, the gravity field disturbances above [[lunar maria]] were measured through [[Lunar Orbiter program|lunar orbiters]], which led to the discovery of concentrations of mass, [[mass concentration (astronomy)|mascons]], beneath the [[Mare Imbrium|Imbrium]], [[Mare Serenitatis|Serenitatis]], [[Mare Crisium|Crisium]], [[Mare Nectaris|Nectaris]] and [[Mare Humorum|Humorum]] basins.<ref>{{harvnb|Muller|Sjogren|1968}}</ref>