Type I migration refers to the process by which planets migrate inward through the protoplanetary disk due to interactions with the gas surrounding them. This migration occurs primarily for smaller planets, such as terrestrial and some gas giants, and is driven by gravitational interactions with the disk material, leading to a reduction in their semi-major axis. The implications of Type I migration are significant as they can affect planetary system architectures and stability, influencing how multiple planets interact within a system.
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