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In [[astrophysics]] and [[physical cosmology]] the '''mass-to-light ratio''', normally design ...and observations suggest that a large fraction is present in the form of [[dark matter]].<ref name=Peacock-1998>{{Cite book |last=Peacock |first=J. A. |url ...

A '''dark-energy star''' is a hypothetical compact [[astrophysical]] object, which a ...eory states that infalling matter is converted into [[vacuum energy]] or [[dark energy]], as the matter falls through the [[event horizon]]. The space with ...

{{Short description|Hypothetical form of dark energy}} ...cosmological constant]], which leads to a [[Big Rip]]. The idea of phantom dark energy is often dismissed, as it would suggest that the [[vacuum]] is [[Fal ...

...scopy]], the '''Lyman-alpha forest''' is a series of [[absorption line]]s in the spectra of distant [[Galaxy|galaxies]] and [[quasar]]s arising from the ...ion inside clouds of [[Outer space#Intergalactic space|intergalactic gas]] in superclusters.<ref name='oort_obit'>{{cite journal | title = Jan Hendrik Oo ...

...ark matter|dark star (dark matter)|the modern concept based on dark energy|dark energy star}} ...ering it dark, hence the name. Dark stars are analogous to [[black hole]]s in [[general relativity]]. ...

{{Short description|Trend in astronomy}} In [[astronomy]], the '''Tully–Fisher relation''' ('''TFR''') is a widely veri ...

...that ''all things are made up of atoms – little particles that move around in perpetual motion, attracting each other when they are a little distance apa ...its [[motion (physics)|motion]] through [[spacetime]], along with related concepts such as [[energy]] and [[force]].<ref>{{cite book ...

...19 |bibcode=2025SciA...11S4057L }} </ref> and numerous gas clouds detected in studies of [[quasar]]s. ...8/25/a-new-class-of-galaxy-has-been-discovered-one-made-almost-entirely-of-dark-matter |date=26 August 2016 |newspaper=[[The Washington Post]] |access-date ...

...intessence|Quintessence (disambiguation)|theories and defunct or classical concepts named after the synonym "Aether"|Aether (disambiguation)}} In [[physics]], '''quintessence''' is a [[hypothesis|hypothetical]] form of [[dark energy]], more precisely a [[scalar field]] minimally coupled to gravity, p ...

{{for|the academic journal|Astrophysics (journal)}} ...086/140401 | pmid = 17796068 | doi-access = free }}</ref> which is studied in [[celestial mechanics]]. ...

{{short description|Hypothetical type of dark matter in physics}} ...ving it a vanishing [[Equation of state (cosmology)|equation of state]]. ''Dark'' indicates that it interacts very weakly with ordinary matter and [[electr ...

...e:Hydrostatic equilibrium.png|thumb|right|Diagram of a newly formed planet in a state of hydrostatic equilibrium.]] ...= Cambridge University Press}}</ref> In general, it is what causes objects in space to be spherical. ...

...hods for the creation of antimatter (specifically [[antihydrogen]]) result in particles and atoms of high kinetic energy, which are unsuitable for [[grav ...rgin of about 20%.<ref name=AnderssonEtAl2023/>{{Rp|table 3}} Difficulties in creating [[quantum gravity]] models have led to the idea that antimatter ma ...

In [[physical cosmology]], the '''age of the universe''' is the [[cosmological |journal=Astronomy & Astrophysics ...

{{Short description|Spectral distortion of cosmic microwave background in galaxy clusters}} ...rowave background]] spectrum are used to detect the disturbance of density in the universe. Using the Sunyaev–Zeldovich effect, dense [[Groups and cluste ...

...ardware and system administration personnel to UK astronomical institutes. In the former respect, it was analogous to the [[United States|US]] [[IRAF]] p ...d version of Starlink and took over maintenance; the task was passed again in mid-2015 to the [[East Asian Observatory]]. The latest version was released ...

| field = [[Astronomy]]<br />[[Astrophysics]] | thesis_title = Physical processes in radio sources and inter-galactic medium ...

{{Short description|Theory that the universe is the same in all directions}} ...n a large scale, and should, therefore, produce no observable inequalities in the large-scale structuring over the course of evolution of the matter fiel ...

...t if photons lost energy over time through collisions with other particles in a regular way, the more distant objects would appear redder than more nearb ...t|Wright, E. L.]] ''[http://www.astro.ucla.edu/~wright/tiredlit.htm Errors in Tired Light Cosmology]''.</ref><ref name="treu" /><ref name="Peebles"> ...

...|upright=1.5|An extreme example of visible light extinction, caused by a [[dark nebula]]]] ...servation|observer]]. Interstellar extinction was first documented as such in 1930 by [[Robert Julius Trumpler]].<ref> ...