Simonetta Di Pippo, Director of the United Nations Office for Outer Space Affairs, addresses the opening ceremony of the Chinese navigation exhibition "From Compass to BeiDou" in Vienna, Austria, on June 11, 2019. A Chinese navigation exhibition opens in Vienna International Center on Tuesday, showing how the nation evolves "from compass to BeiDou" - as the exhibition is themed - in time service, surveying, mapping and navigation technologies. (Xinhua/Guo Chen)