IN THE SPOTLIGHT

PARCS - Primary Atomic Reference Clock in Space

PARCS is an atomic-clock mission scheduled to fly on the International Space Station (ISS) in early 2005. The mission, funded by NASA and including NIST as a partner, involves a laser-cooled cesium atomic clock, a high stability hydrogen-maser oscillator, and a time-transfer system using Global Positioning System (GPS) satellites. The objectives of the mission are to:

• Test gravitational theory
• Study laser-cooled atoms in microgravity
• Improve the accuracy of timekeeping on earth

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