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Ştire: Gaurile negre s-au format inaintea galaxiilor


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t_788410.jpg Gaurile negre, care se afla in centrul tuturor galaxiilor, au fost primele formatiuni aparute la inceputul dezvoltarii Universului, potrivit unui studiu publicat in Statele Unite, transmite MEDIAFAX. "Gaurile negre au fost primele formatiuni aparute", a explicat Chris Carilli, astronom in cadrul National Radio Astronomy Observatory (NRAO), care a adaugat ca "informatiile care confirma aceasta ipoteza devin tot mai numeroase". Carilli a prezentat concluziile principale rezultate din cele mai...

 

 

 

vezi intregul articol

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Cred că se referă la găurile negre care se află în centrul galaxiilor. E un caz tipic de virgule puse aiurea. În centrul galaxiei este o gaură neagră mai veche decît galaxia; în afară de gaura aia neagră, mai pot exista și alte găuri negre, posibil mai noi decît galaxia.

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Nu neapărat. Dacă e foarte multa materie într-un spațiu foarte mic, atracția gravitațională e atît de mare încît se formează direct o gaură neagră, fără să mai apuce să treacă prin stadiul de stea. Adică na, nu știu, n-am fost acolo, dar sună plauzibil.

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Gravitational collapse requires great density. In the current epoch of the universe these high densities are only found in stars, but in the early universe shortly after the big bang densities were much greater, possibly allowing for the creation of black holes. The high density alone is not enough to allow the formation of black holes since a uniform mass distribution will not allow the mass to bunch up. In order for primordial black holes to form in such a dense medium, there must be initial density perturbations that can then grow under their own gravity. Different models for the early universe vary widely in their predictions of the size of these perturbations. Various models predict the creation of black holes, ranging from a Planck mass to hundreds of thousands of solar masses.[76] Primordial black holes could thus account for the creation of any type of black hole.

 

http://en.wikipedia.org/wiki/Black_hole

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