Linked from
The 17 pages that link to Planet formation, each with the reason it gives.
T Tauri starNarrower topic: Observations of T Tauri disks expose the early stages of this process.
Planetary systemNarrower topic: It explains how a disk becomes a planetary system.
ProtoplanetNarrower topic: Protoplanets are an intermediate stage in this broader process.
TW HydraeNarrower topic: TW Hydrae’s disk offers observations of an early setting for this process.