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NASA researchers Frank Hui and Ernest Fretter
Frank Hui, pictured left, an aerospace test engineer, and Ernest Fretter, who oversees the arc jet facility at NASA Ames, where scientists are testing materials that will eventually insulate spacecraft traveling to the moon.
Temperature gauges inside the arc jet facility
Temperature gauges inside the arc jet facility allow scientists to simulate conditions and temperatures that a spacecraft would encounter on re-entry to the Earth's atmosphere.
Instruments measure temperature of heat-shield materials
Outside the arc jet facility, instruments measure the surface temperature of the heat shield materials to see how they react to extreme temperatures.