Protoplanetary disks | Wikipedia audio article
Channel: wikipedia tts
Date: 02/06/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Protoplanetary_disk


00:00:50 1 Formation
00:04:10 2 Planetary system
00:05:44 3 Debris disks
00:06:57 4 Relation to abiogenesis
00:07:33 5 Gallery



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SUMMARY
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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 gases or other material may be falling from the inner edge of the disk onto the surface of the star. 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.
In July 2018, the first confirmed image of such a disk, containing a nascent exoplanet, named PDS 70b, was reported.