Astrometry is transversal to Astronomy. Thanks to increased levels of precision and accuracy it can probe and provide keys to understand Dark Matter, to reveal planetary system architectures, to empower studies of Gravity, of the behavior of matter in compact objects and to determine the Hubble constant to unprecedented accuracies.

At the commemorations of IAU 100th anniversary, just after the Gaia DR2 and with the excitement of future mission proposals and ground infrastructures, the IAU348 Symposium aims to join different communities to foster bridges: bridges that may allow different communities to address together some of the most profound questions of modern Science. What is Dark Matter? Is there life elsewhere in the Universe?