Solar-Terrestrial Physics: The Study of Mankind's Newest Frontier Solar-Terrestrial Physics (STP) has been around for 100 years. However, it only became known as a scientific discipline under that name when the physical domain studied by STP became accessible to in situ observation and measurement by man or man-made instruments. Indeed, it was STP that provided the initial scientific driving force for the launching of man-made devices into extra-terrestrial space during the International Geophysical Year - aided of course by the genetically engrained drive of humans to expand their frontiers...