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2604760 
Journal Article 
Early phases of planet formation in protoplanetary disks 
Henning, Th 
2008 
1 
Physica Scripta
ISSN: 0031-8949 
T130 
WOS:000257677400020 
This paper will review recent advancements in our understanding of protoplanetary disks, the region where we expect planets to form. We include a discussion of transition disks and their relevance for our understanding of planet formation. We summarize observational evidence for grain growth and alteration, and discuss the challenges to understanding planetesimal formation.