Remote sensing geophysical exploration refers to the method of detecting the information of electromagnetic waves radiated (or reflected) by ground objects with various sensors at a relatively distant location to ascertain the various geological or geological conditions. Based on the above definitions, Which of the following are remote sensing geophysical surveys:. ["Doctors use X-rays to examine the lesions of patients' organs.", 'Scouts use mine detection devices to find buried mines.', 'Scientists observe stars in outer space through the "sky eye" system.', 'Scientists use satellites for geological exploration of a coastal area.']