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S. Korean scientists develop 'super' precision measurement system
SEOUL, Aug. 17 (Yonhap) -- South Korean scientists said Tuesday they have developed a "super" precise measurement system that can help align telescope satellites in space, opening the way for the discovery of faraway planets
Scientists led by Kim Seung-woo, a mechanical engineering professor at the Korea Advanced Institute of Science and Technology (KAIST), said actual tests showed the system having a so-called resolving power of 150 nanometers at a distance of 700 meters. A nanometer is equal to one-billionth of a meter.

This type of precision also allows precise measurement of up to 1 nanometer in a vacuum environment similar to those found in space. At present, resolving power of 1 millimeter or one-thousandth of a meter is considered as the best measurement attainable.