Thin layers of gold on astronaut's visors protect eyes from both ultraviolet and infrared solar radiation. Gold coatings on spacecraft also help keep temperatures low inside the vehicle. Gold's resistance to corrosion in space leads to its use in coating bearings, thereby overcoming serious mechanical problems that plagued some early satellites having exposed moving parts. The manufacture of high-pressure seals, reflective window glass and electronic components all utilize gold. Gold is reliable because of its corrosion resistance, its strength and its workability.
Consequently gold is in high demand, especially in the rapidly expanding electronics industry.
Fifteen percent of all gold consumed in the United States is for teeth fillings and dental bridgework. Finely divided radioactive gold also has medical use in the treatment of arthritis. This use especially pleases my prospector friend when he is feeling the effects of too many hours standing in the creeks.