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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.

The nebular hypothesis of solar system formation describes how protoplanetary disks are thought to evolve into planetary systems. Electrostatic and gravitational interactions may cause the dust and ice grains in the disk to accrete into planetesimals. This process competes against the stellar wind, which drives the gas out of the system, and gravity (accretion), which pulls material into the central T Tauri star.

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Image credit: NASA/JPL, ESO

Build your own game by clicking today's #GoogleDoodle celebrating the pioneer of the video game cartridge: Jerry Lawson! https://g.co/doodle/pqvgtc3

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Build your own game by clicking today's #GoogleDoodle celebrating the pioneer of the video game cartridge: Gerald "Jerry" Lawson!

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Copyright: Definition, Types, and How It Works

Copyright is the legal ownership of intellectual property with the right to control its reproduction and distribution.

What is Copyright law the right to cōpy proper.ly

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Jefe Indio - Rápidamente (Official Music Video) | Cyberpunk aesthetic, Music studio room, Anime wallpaper 1920x1080

Dec 10, 2018 - Actress: Catalina González. Director: Ticoy Rodriguez. Director of Photography: Guillermo Helo J-O. Makeup & Hair: Bea Alvar