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globular star clusters. Two main divisions were defined as Population I star and population II, with another newer, hypothetical division called population III...

protoplanetary disk is a rotating circumstellar disc of dense gas and dust surrounding a young newly formed star, a T Tauri star, or Herbig Ae/Be star. The protoplanetary...

frequently a star. Friction, uneven irradiance, magnetohydrodynamic effects, and other forces induce instabilities causing orbiting material in the disk to spiral...

grouped into Population I (young) and Population II (old). Location: In the Milky Way galaxy the groups are described as thin disk, thick disk, central bulge...

nebula L1527 (2022). Stellar birthline Pre-main-sequence star Protoplanetary disk Quasi-star Star formation Stellar evolution Stahler, S. W. & Palla, F....

Accretion disk – Structure formed by diffuse material in orbital motion around a massive central body Blitzar – Hypothetical type of neutron star Thorne–Żytkow...

protoplanetary disk and powered mainly by the conversion of gravitational energy. The period of gravitational contraction lasts about 10 million years for a star like...

A galactic disc (or galactic disk) is a component of disc galaxies, such as spiral galaxies like the Milky Way and lenticular galaxies. Galactic discs...

The thick disk is one of the structural components of about 2/3 of all disk galaxies, including the Milky Way. It was discovered first in external edge-on...

having been gathered up by the disk, and the protostar becomes a classical T Tauri star. The latter have accretion disks and continue to accrete hot gas...

within three categories: unidirectional regeneration, disk-dependent bidirectional regeneration, and disk-independent bidirectional regeneration. In each case...

3 kly (0.4 kpc) from the plane of the galactic disk. This likely puts them outside the thick disk population of stars. Zeta Reticuli has no known planets...

The West Indian brittle star, Ophiocomella ophiactoides, frequently undergoes asexual reproduction by fission of the disk with subsequent regeneration...

6 light-years. accretion disk A roughly circular mass of diffuse material in orbit around a central object, such as a star or black hole. The material...

that of the Sun. It is one of the closest metal-poor (population II) stars to Earth. The star was already known by 1912 when W. S. Adams measured its...

motion, have led to the designation "intermediate population II star", between a halo and disk star. However, some recently published scientific papers...

central star. Within the nebula and surrounding the central hot star is a cluster of young, lower-mass stars, 86% of which have circumstellar disks. X-ray...

with their large-scale disks, and ES galaxies with their intermediate scale disks, a subset of the "early-type" galaxy population. Most elliptical galaxies...

brightness variability are clumps (protoplanets and planetesimals) in the disk surrounding T Tauri stars. Their spectra show a higher lithium abundance...

This star displays an emission of infrared excess that suggests there is a circumstellar disk of debris in orbit. HN Pegasi is most likely a thin disk population...