21 October 2016
China's cold atomic clock is the most precise time-keeping device ever built. The clock only weighs a couple kilograms and could fit comfortably in the boot of a car. And because it is powered by atoms, it won't have to be reset for another 30 million years. The launch of Tiangong-2 marks China's transition from a follower in space research, to a pioneer. China's cold atomic clock project is a good example of that transition. "The initial plan was brought up in 2006. We have made great efforts over the past ten years. We have been through a lot... and we have been successful" Liu said.
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