Abstract
The study of protoplanetary disks was for a long time based on indirect measurements of gas and dust, limiting our understanding of planet formation . The arrival of ALMA has revolutionized our view of the structure of these disks. The Early Science ALMA observations in the last few years have revealed rings, asymmetries, dust/gas segregation, gas dynamics, evidence for dust trapping and vortices, and many more exciting phenomena that have been predicted for decades in physical models of disks. In this chapter I review the most important ALMA discoveries and the next steps in planet formation studies.
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