Definition of Protoplanetary. Meaning of Protoplanetary. Synonyms of Protoplanetary

- A protoplanetary disk is a rotating cir****stellar disc of dense gas and dust surrounding a young newly formed star, a T Tauri star, or Herbig Ae/Be star...
- A protoplanetary nebula or preplanetary nebula (PPN, plural PPNe) is an astronomical object which is at the short-lived episode during a star's rapid evolution...
- years to form, with the protoplanetary disk evolving into a planetary system over the next 10–100 million years. The protoplanetary disk is an accretion...
- example of a planetary nebula. The Red Rectangle Nebula, an example of a protoplanetary nebula. The delicate s**** of SNR B0509-67.5 Tycho Supernova remnant...
- This is a list of protoplanetary nebulae. These objects represent the final stage before a planetary nebula. During this stage, the red giant star begins...
- the line of fire of a protoplanetary disk. According to com****tionally modelled simulations, a SNR striking a protoplanetary disk would result in significant...
- dense region of a molecular cloud collapsed, forming the Sun and a protoplanetary disc. The Sun is an ordinary main sequence star that maintains a balanced...
- Planetesimals /plænɪˈtɛsɪməlz/ are solid objects thought to exist in protoplanetary disks and debris disks. Believed to have formed in the Solar System...
- is too faint to be seen with the unaided eye. It is surrounded by a protoplanetary disk marked by dark bands visible in submillimeter radiation that may...
- collapses out of a nebula to create a young protostar orbited by a protoplanetary disk. Planets grow in this disk by the gradual ac****ulation of material...