Protoplanetary disk

Atacama Large Millimeter Array image of HL Tauri.[1][2]

Protoplanetary Disk. Simulated Spiral Arm vs Observational Data.[7]

Supernova remnant ejecta producing planet-forming material.

A protoplanetary disk is a rotating circumstellar disk of dense gas and dust surrounding a young newly formed star, a T Tauri star, or Herbig Ae/Be star. The protoplanetary disk may also be considered an accretion disk for the star itself, because gasses or other material may be falling from the inner edge of the disk onto the surface of the star. But this process should not be confused with the accretion process thought to build up the planets themselves. Externally illuminated photo-evaporating protoplanetary disks are called proplyds.

单词	Protoplanetary Discs
释义	Protoplanetary Discs 英语百科 Protoplanetary disk A protoplanetary disk is a rotating circumstellar disk of dense gas and dust surrounding a young newly formed star, a T Tauri star, or Herbig Ae/Be star. The protoplanetary disk may also be considered an accretion disk for the star itself, because gasses or other material may be falling from the inner edge of the disk onto the surface of the star. But this process should not be confused with the accretion process thought to build up the planets themselves. Externally illuminated photo-evaporating protoplanetary disks are called proplyds.
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Protoplanetary Discs

Protoplanetary disk