Planets form in circumstellar discs around young stars. Starting with sub-micron sized dust particles, giant planet formation is all about growing 14 orders of magnitude in size. It has become increasingly clear over the past decades that during all stages of giant planet formation, the building blocks are extremely mobile and can change their semimajor axis by substantial amounts. In this chapter, we aim to give a basic overview of the physical processes thought to govern giant planet formation and migration, and to highlight possible links to water delivery.

中文翻译：

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巨行星形成与迁移

行星在年轻恒星周围的星周盘中形成。从亚微米大小的尘埃粒子开始，巨行星的形成大约在大小上增长了 14 个数量级。在过去的几十年里，越来越清楚的是，在巨行星形成的所有阶段，构建块都具有极强的移动性，可以大量改变它们的半长轴。在本章中，我们的目标是对被认为控制巨行星形成和迁移的物理过程进行基本概述，并强调与供水的可能联系。