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Qu'est-ce (qui) est H-object - définition
H-object
In mathematics, specifically homotopical algebra, an H-object is a categorical generalization of an H-space, which can be defined in any category \mathcal{C} with a product \times and an initial object *. These are useful constructions because they help export some of the ideas from algebraic topology and homotopy theory into other domains, such as in commutative algebra and algebraic geometry.
Herbig–Haro object
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![HH 2]] (lower right), [[HH 34]] (lower left), and [[HH 47]] (top) were numbered in order of their discovery; it is estimated that there are up to 150,000 such objects in the Milky Way.](https://commons.wikimedia.org/wiki/Special:FilePath/HH 47 HH 34 and HH 2.jpg?width=200 "HH 2]] (lower right), [[HH 34]] (lower left), and [[HH 47]] (top) were numbered in order of their discovery; it is estimated that there are up to 150,000 such objects in the Milky Way.")
![infrared]] by the [[Spitzer Space Telescope]]](https://commons.wikimedia.org/wiki/Special:FilePath/Herbig-Haro 49 50.jpg?width=200 "infrared]] by the [[Spitzer Space Telescope]]")
![''Spitzer'' Space Telescope]], showing the medium in immediate vicinity of the star being silicate-rich](https://commons.wikimedia.org/wiki/Special:FilePath/Ssc2003-06g.jpg?width=200 "''Spitzer'' Space Telescope]], showing the medium in immediate vicinity of the star being silicate-rich")
SMALL PATCHES OF NEBULOSITY ASSOCIATED WITH NEWLY BORN STARS
Herbig-Haro objects; Herbig-Haro Object; Herbig Haro objects; HH-30; Herbig Haro object; HH object; Herbig-Haro object; Herbig-Haro; Herbig haro object; H-H Objects; H-H Object; Herbig–Haro objects; HH Object; HH Objects; H H Object; H H Objects
Herbig–Haro (HH) objects are bright patches of nebulosity associated with newborn stars. They are formed when narrow jets of partially ionised gas ejected by stars collide with nearby clouds of gas and dust at several hundred kilometres per second.
object
WIKIMEDIA DISAMBIGUATION PAGE
Object orientation; Objects; Oject; Object (disambiguation); Objecct; Event-driven object-orientation; Objects (disambiguation)
n.
1.
Thing, reality, particular, existence, fact, phenomenon, percept, thing perceived, external reality.
2.
Mark, aim, target, butt; goal, end, destination; recipient, correlate, or complement (of a conscious subject).
3.
End, aim, intent, intention, purpose, design, motive, use, view, drift, goal, final cause.
4.
(Gram.) Regimen, complement.
