Simonetta Di Pippo (R), Director of the United Nations Office for Outer Space Affairs, visits 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)