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...
- HH-30 (also V1213 Tauri) is an edge-on protoplanetary disk that is surrounded by jets and a disk wind. HH-30 is located in the dark cloud LDN 1551 in the...
- 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...
- dwarf or free-floating planetary-m**** object that is surrounded by a protoplanetary disk, actively accreting material from it. KPNO-Tau 12 was identified...
- spectral and luminosity classification system, and the presence of a protoplanetary disk, among others. Nearly all of the methods of determining age require...
- 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...
- collapsing clouds of gas and dust. Astronomers have directly observed protoplanetary disks and brown dwarfs within the nebula, intense and turbulent motions...
- 0.76 M☉ and is approximately 5.4 million years old. The star has a protoplanetary disk containing two nascent exoplanets, named PDS 70b and PDS 70c, which...