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Coming together of two stars
A stellar collision is the coming together of two stars caused by stellar dynamics within a star cluster, or by the orbital decay of a binary star due
Stellar_collision
Postulated future astronomical event
The Andromeda–Milky Way collision is a galactic collision that may occur in about 4.5 billion years between the two largest galaxies in the Local Group—the
Andromeda–Milky_Way_collision
Process that leads to gradual decrease of the distance between two orbiting bodies
with incineration by the star's radiation (such as for comets). Collisions of stellar-mass objects are usually accompanied by effects such as gamma-ray
Orbital_decay
Class of hypothetical megastructures
of the Sun, Caplan deems 10 million years to be sufficient for a stellar collision avoidance. His proposal was commissioned by the German educational
Stellar_engine
red nova, an explosion thought to be caused by stellar collision Solar flares are a minor type of stellar explosion Tidal disruption event, the pulling
List of stellar explosion types
List_of_stellar_explosion_types
Black hole formed by a collapsed star
A stellar black hole (or stellar-mass black hole) is a black hole formed by the gravitational collapse of a star. They have masses ranging from about five
Stellar_black_hole
Changed position of star vs background
Stellar parallax is the apparent shift of position (parallax) of any nearby star (or other object) against the background of distant stars. By extension
Stellar_parallax
Outermost layer of a star's atmosphere
Scientists have greater access to the solar corona than they do to other stellar coronae, since it is inside our solar system. This means that the coronae
Stellar_corona
Type of stellar collision
A neutron star merger is the stellar collision of neutron stars. When two neutron stars fall into mutual orbit, they gradually spiral inward due to the
Neutron_star_merger
Process where a red giant star engulfs a planet
star Neutron star merger Stellar collision Leary, Ashlyn R.; McSwain, M. Virginia (April 2025). "Dinner with a Star: Stellar Engulfment of Exoplanet Systems"
Stellar_engulfment
Grouping of stars by similar metallicity
1944, Walter Baade categorized groups of stars within the Milky Way into stellar populations. In the abstract of the article by Baade, he recognizes that
Stellar_population
Japanese light novel series
Blood" Chapter 3: "The Great Spear Is Wrapped in Blood" Chapter 4: "Stellar Collision" Side story: "Impossible Coexistence" 7 January 20, 2026 978-4-86716-901-8
Witch_and_Mercenary
Large self-illuminated object in space
Retrieved 21 January 2014. Lombardi, J. C. Jr.; et al. (2002). "Stellar Collisions and the Interior Structure of Blue Stragglers". The Astrophysical
Star
Outer region of the volume of a star
The stellar atmosphere is the outer region of the volume of a star, lying above the stellar core, radiation zone and convection zone. The stellar atmosphere
Stellar_atmosphere
Creation of chemical elements within stars
In astrophysics, stellar nucleosynthesis is the creation of chemical elements by nuclear reactions within stars. Stellar nucleosynthesis has occurred
Stellar_nucleosynthesis
cluster Stellar collision Stellar core Stellar coronae Stellar density Stellar disk Stellar distance Stellar drift Stellar dynamics Stellar engine Stellar envelope
List_of_stellar_properties
Classification of stars based on spectral properties
In astronomy, stellar classification is the classification of stars based on their spectral characteristics. Electromagnetic radiation from the star is
Stellar_classification
Region at the center of a star
A stellar core is the extremely hot, dense region at the center of a star. For an ordinary main sequence star, the core region is the volume where the
Stellar_core
Early stage in the process of star formation
its parent molecular cloud. It is the earliest phase in the process of stellar evolution. For a low-mass star (i.e. that of the Sun or lower), it lasts
Protostar
Hypothetical early-universe star with a black hole core
resulted from the core of a large supermassive protostar collapsing into a stellar-mass black hole, where the outer layers of the protostar are massive enough
Quasi-star
Collapsed core of a massive star
neutron stars are the second-smallest and second-densest known class of stellar objects. Neutron stars have a radius on the order of 10 kilometers (6 miles)
Neutron_star
Rotational center of the Milky Way galaxy
on the stellar population of the galactic center and the S cluster. They limit the number of massive O-type stars through stellar collisions. In May
Galactic_Center
Light from the stars
telescopes is the basis for many fields of astronomy, including photometry and stellar spectroscopy. Hipparchus did not have a telescope or any instrument that
Starlight
Hypothetical class of star that develops from a red dwarf
stars. Simulations have been conducted on the evolution of red dwarfs with stellar mass between 0.06 M☉ and 0.25 M☉. Of the masses simulated, the bluest of
Blue_dwarf_(red-dwarf_stage)
Changes to stars over their lifespans
Stellar evolution is the process by which a star changes over the course of time. Depending on the mass of the star, its lifetime can range from a few
Stellar_evolution
second brightest is Sirius at −1.46 mag. For comparison, the brightest non-stellar objects in the Solar System have maximum brightnesses of: Moon −12.7 mag
List_of_brightest_stars
Stellar classification
and white dwarfs which are much more common, the last of which being stellar remnants). A G-type main-sequence star with the mass of the Sun will fuse
G-type_main-sequence_star
Small number of stars that orbit each other
A star system or stellar system is a small number of stars that orbit each other, bound by gravitational attraction. It may sometimes be used to refer
Star_system
Flow of gas ejected from the upper atmosphere of a star
A stellar wind is a flow of gas ejected from the upper atmosphere of a star. It is distinguished from the bipolar outflows characteristic of young stars
Stellar_wind
Study of the movement of stars
In astronomy, stellar kinematics is the observational study or measurement of the kinematics or motions of stars through space. Stellar kinematics encompasses
Stellar_kinematics
Main sequence star that is more luminous and bluer than expected
1991-07-24. Retrieved 2006-05-24. Leonard, Peter J. T. (1989). "Stellar collisions in globular clusters and the blue straggler problem". The Astronomical
Blue_straggler
Curve on the Hertzsprung-Russell diagram representing stars of a particular age
In stellar evolution, an isochrone is a curve on the Hertzsprung-Russell diagram, representing a population of stars of the same age but with different
Stellar_isochrone
Calculated property of a star or planet
luminosity of a star is then L = 4πR2σTeff4, where R is the stellar radius. The definition of the stellar radius is obviously not straightforward. More rigorously
Effective_temperature
Structure of stars
Stellar structure models describe the internal structure of a star in detail and make predictions about the luminosity, the color and the future evolution
Stellar_structure
Star not gravitationally bound to any galaxy
Collectively, intergalactic stars are referred to as the intracluster stellar population, or IC population for short, in the scientific literature. The
Intergalactic_star
Astronomical object without the mass to sustain hydrogen fusion
enough mass to fuse hydrogen and helium, hence do not undergo the usual stellar evolution that limits the lifetime of stars. A substellar object with a
Substellar_object
Magnetic field generated inside a star
A stellar magnetic field is a magnetic field generated by the motion of conductive plasma inside a star. This motion is created through convection, which
Stellar_magnetic_field
Type of emission nebula created by dying red giants
perhaps a few tens of millennia, compared to considerably longer phases of stellar evolution. Once all of the red giant's atmosphere has been dissipated,
Planetary_nebula
Star of relatively small size and low luminosity
to some star-sized objects that are not stars and some types of compact stellar remnants. The term was originally coined in 1906 when the Danish astronomer
Dwarf_star
Type of large cool star
intermediate mass (roughly 0.3–8 solar masses (M☉)) in a late phase of stellar evolution. The outer atmosphere is inflated and tenuous, making the radius
Red_giant
Star's outer shell from which light is radiated
features are too fine to be directly observed on other stars; however, stellar spatial structures have been indirectly observed, and can behave like sunspots
Photosphere
Hypothetical hybrid star type
of Type WN8 Thorne-Zytkow Objects?". In Shara, Michael M. (ed.). Stellar Collisions, Mergers and their Consequences. ASP Conference Proceedings. Vol. 263
Thorne–Żytkow_object
Cavity of hot gas blown from a star
A stellar-wind bubble is a cavity light-years across filled with hot gas blown into the interstellar medium by the high-velocity (several thousand km/s)
Stellar-wind_bubble
Star in its early stage of evolution
Young stellar object (YSO) denotes a star in its early stage of evolution. This class consists of two groups of objects: protostars and pre-main-sequence
Young_stellar_object
Stellar classification
2020–2026. Retrieved 2026-01-15. E. Mamajek (2022-04-16). "A Modern Mean Dwarf Stellar Color and Effective Temperature Sequence". Retrieved 2022-05-14. Steigerwald
K-type_main-sequence_star
Hypothetical compact star
conserved particle number. A Q-star may be mistaken for a stellar black hole. Some stellar black holes might be grey holes, two of which are V404 Cygni
Q_star
Mass of a star in astronomy
Stellar mass is a phrase that is used by astronomers to describe the mass of a star. It is usually enumerated in terms of the Sun's mass as a proportion
Stellar_mass
Star whose brightness fluctuates, as seen from Earth
radii of their component stars, which is especially useful for modelling stellar evolution. An ancient Egyptian calendar of lucky and unlucky days composed
Variable_star
Angular motion of a star about its axis
Stellar rotation is the angular motion of a star about its axis. The rate of rotation can be measured from the spectrum of the star, or by timing the
Stellar_rotation
Classification in astronomy
Since most compact object types represent endpoints of stellar evolution, they are also called stellar remnants, and accordingly may be called dead stars
Compact_object
Astronomical category of stars
observed types of star: Binary stars with highly variable emission and stellar spectral type Fe a blue supergiant with a forest of forbidden FeII lines
Iron_star
Gravitational process studied in astronomy
within molecular clouds in interstellar space—sometimes referred to as "stellar nurseries" or "star-forming regions"—collapse and form stars. As a branch
Star_formation
Scatter plot of stars showing the relationship of luminosity to stellar classification
relationship between the stars' absolute magnitudes or luminosities and their stellar classifications or effective temperatures. It is also sometimes called
Hertzsprung–Russell_diagram
Theoretical stellar remnant
A black dwarf is a theoretical stellar remnant, specifically a white dwarf that has cooled sufficiently to no longer emit significant heat or light. Because
Black_dwarf
Unit of time
5194/bgd-2-1665-2005. S2CID 3619702. Cox, T. J.; Loeb, Abraham (2008-05-01). "The collision between the Milky Way and Andromeda". Monthly Notices of the Royal Astronomical
Galactic_year
Stellar classification
as the spiral arms of a spiral galaxy or a pair of galaxies undergoing collision and merger (such as the Antennae Galaxies). These stars illuminate any
O-type_star
Branch of astrophysics
mechanics. In accretion disks and stellar surfaces, the dense plasma or gas particles collide very frequently, and collisions result in equipartition and perhaps
Stellar_dynamics
(hypothetical star) Nibiru cataclysm Hypernova Micronova Solar flare Stellar collision Religious or superstitious 2011 end times prediction 2012 phenomenon
List_of_apocalyptic_films
Type of neutron star with beams of radiation
most stable period, PSR J0437−4715 The first millisecond pulsar with 2 stellar mass companions, PSR J0337+1715 PSR J1841−0500, stopped pulsing for 580
Pulsar
Type of supernova in binary systems
discovery hints at stellar collision". New Scientist. 2007-01-03. Retrieved 2007-01-06. Whipple, Fred L. (1939). "Supernovae and Stellar Collisions". Proceedings
Type_Ia_supernova
Stellar classification distinguished by bright blue luminosity
Acrux. This class of stars was introduced with the Harvard sequence of stellar spectra and published in the Revised Harvard photometry catalogue. The
B-type_main-sequence_star
Hypothetical type of neutron star
Guest Gravity Intergalactic Neutron star merger Planet-hosting stars Stellar collision Stellar engulfment Tidal disruption event Category Stars portal
Blitzar
Gas and dust surrounding a newly formed star
Robertson drag, collisions, and radiation pressure (typically hundreds to thousands of years), it is thought that this dust is from the collisions of planetesimals
Protoplanetary_disk
Proposed spacecraft propulsion method
the Sun, but Caplan deems 10 million years to be sufficient for a stellar collision avoidance. Several of the obvious technical difficulties with the
Bussard_ramjet
typically around 6.5 apparent magnitude. The known 133 objects are bound in 95 stellar systems. Of those, 103 are main sequence stars: 78 red dwarfs and 25 "typical"
List_of_nearest_stars
Brightness of a celestial object observed from the Earth
1×1014 kilometres; 1.9×1014 miles). Therefore, it is of greater use in stellar astrophysics since it refers to a property of a star regardless of how
Apparent_magnitude
Type of interstellar cloud
A molecular cloud—sometimes called a stellar nursery if star formation is occurring within—is a type of interstellar cloud of which the density and size
Molecular_cloud
Class of young variable stars
stars of less than 3 solar masses (M☉) in the pre-main-sequence phase of stellar evolution. It ends when a star of 0.5 M☉ or larger develops a radiative
T_Tauri_star
Type of star, larger and brighter than the Sun
which point it will become a helium white dwarf., § 4.1, 6.1. According to stellar evolution theory, no star of such low mass can have evolved to that stage
Giant_star
Supernova that ejects a large mass at unusually high velocity
astrophysical jets and surrounded by an accretion disk. It is a type of stellar explosion that ejects material with an unusually high kinetic energy, an
Hypernova
Hypothetical global-scale disaster risk
extinction – Ongoing extinction event caused by human activity Impact event – Collision of two astronomical objects List of global issues – List of environmental
Global_catastrophic_risk
Hypothetical types of stars
the most energetic black hole merger ever recorded, may be the head-on collision of two boson stars. In addition, gravitational wave signals from compact
Exotic_star
Hypothesized alternative to a black hole
Gravity Intergalactic Neutron star merger Planet-hosting stars Stellar collision Stellar engulfment Tidal disruption event Category Stars portal Commons
Gravastar
Hypothetical star heated by dark-matter annihilation
Gondolo, Paolo (2008). "Dark Matter and the First Stars: A New Phase of Stellar Evolution". Physical Review Letters. 100 (5) 051101. arXiv:0705.0521. Bibcode:2008PhRvL
Dark_star_(dark_matter)
List of the hottest known stars
Shenar, T.; Sander, A. A. C.; Todt, H.; Gallagher, J. S. (2018-07-01). "Stellar population of the superbubble N 206 in the LMC. II. Parameters of the OB
List_of_hottest_stars
Hot, luminous star with a spectral type of A9 or earlier
supergiants, although new research suggests they could be the result of stellar mergers. The majority of supergiants are also blue (B-type) supergiants;
Blue_supergiant
Type of neutron star with a strong magnetic field
star discovered by researchers]". McGill University. "The Hibernating Stellar Magnet: First Optically Active Magnetar-Candidate Discovered". ESO. 23
Magnetar
American foreign policy think tank
hazardous object Near-Earth object Impact winter Rogue planet Rogue star Stellar collision Cosmological Big Crunch Big Rip Cosmological phase transition False
Nuclear_Threat_Initiative
Light emitted by the Sun
Gravity Intergalactic Neutron star merger Planet-hosting stars Stellar collision Stellar engulfment Tidal disruption event Category Stars portal Commons
Sunlight
Type of star
were much smaller in size and matched predictions for a strange dwarf. Stellar classification Exotic star Page, Dany; Reddy, Sanjay (2006-11-01). "Dense
Strange_star
Methods for estimating the age of a star
in stellar age estimation, an attempt to identify within reasonable degrees of confidence what the age of a star is. These methods include stellar evolutionary
Stellar_age_estimation
Main-sequence star of spectral type O
about −5.8 (eqv. 18,000 times brighter than the sun). Their light-driven stellar winds have a terminal velocity around 2,000 km/s. The most luminous class O
O-type_main-sequence_star
Structure formed by diffuse material in orbital motion around a massive central body
gas-poor that its angular momentum transport is dominated by solid body collisions and disk-moon gravitational interactions. The model is in agreement with
Accretion_disk
Stage of stellar evolution
The horizontal branch (HB) is a stage of stellar evolution that immediately follows the red-giant branch in stars whose masses are similar to the Sun's
Horizontal_branch
Region of a star
Introduction to Stellar Astrophysics (1st ed.). John Wiley and Sons. p. 168. ISBN 978-1-119-96497-1. Pols, Onno Rudolf (2011). Stellar Structure and Evolution
Radiative_zone
Hypothetical astronomical object
is formed and, indeed, well before the Planck scale for distance: for a stellar mass black hole the Planck star would be of the order of 10−12 m – for
Planck_star
Star that never sets due to its apparent proximity to a celestial pole
Gravity Intergalactic Neutron star merger Planet-hosting stars Stellar collision Stellar engulfment Tidal disruption event Category Stars portal Commons
Circumpolar_star
Isolated, small, and opaque nebula
Lin; Clemens, Dan P. (January 1992). "Discovery of outflows from young stellar objects in BOK globules". Astrophysical Journal Letters. 385: L21. Bibcode:1992ApJ
Bok_globule
Process by which stars are named
In astronomy, stars have a variety of different stellar designations and names, including catalogue designations, current and historical proper names
Stellar designations and names
Stellar_designations_and_names
Grouping of evolved cool luminous stars
diagram populated by evolved cool luminous stars. This is a period of stellar evolution undertaken by all low- to intermediate-mass stars (about 0.5
Asymptotic_giant_branch
Stellar classification
this particular scenario would be the more intense light and the shorter stellar lifespan of the home star. F-type stars are known to emit much higher energy
F-type_main-sequence_star
Central region of the Sun
through a better understanding of neutrino oscillation. Active region Stellar core García, Rafael A.; Turck-Chièze, Sylvaine; Jiménez-Reyes, Sebastian
Solar_core
R.; et al. (July 2025). "The Probable Direct-imaging Detection of the Stellar Companion to Betelgeuse". The Astrophysical Journal Letters. 988 (2): L47
List_of_proper_names_of_stars
Velocity of an object as the rate of distance change between the object and a point
"Astrometric radial velocities. I. Non-spectroscopic methods for measuring stellar radial velocity". Astron. Astrophys. 348: 1040–1051. arXiv:astro-ph/9907145
Radial_velocity
Hot, giant star of early spectral type
Gravity Intergalactic Neutron star merger Planet-hosting stars Stellar collision Stellar engulfment Tidal disruption event Category Stars portal Commons
Blue_giant
Continuous band of stars that appears on plots of stellar color versus brightness
the main sequence is a classification of stars which appear on plots of stellar color versus brightness as a continuous and distinctive band. Stars spend
Main_sequence
Astronomical theory about the Solar System
process naturally results in the appearance of accretion disks around young stellar objects. At the age of about 1 million years, 100% of stars may have such
Nebular_hypothesis
Set of non-stellar objects in orbit around a star
A planetary system consists of a set of non-stellar bodies which are gravitationally bound to and in orbit of a star or star system. Generally speaking
Planetary_system
B-type star with emission lines
polarization result from the scattering of stellar light in the disk, while the line emission is formed by re-processing stellar ultraviolet light in the gaseous
Be_star
Compact exotic star which forms matter consisting mostly of quarks
will occur and hinder total gravitational collapse that would form a stellar black hole. If these ideas are correct, quark stars might occur, and be
Quark_star
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