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Protoplanetary Disks

A protoplanetary disk is a rotating circumstellar disk of dense gas surrounding a young newly formed star, a t tauri star, or herbig ae/be star. the protoplanetary disk may also be considered an accretion disc 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.