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> Știre: Gaurile negre s-au format inaintea galaxiilor

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post Jan 8 2009, 03:30 PM
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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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vall
post Jan 9 2009, 08:11 PM
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Am impresia ca autorul articolului nu are habar despre ceea ce vorbeste...!


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Yelle
post Dec 12 2014, 12:14 PM
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E ca si cum ai spune ca s-a format gaura inaintea covrigului. emo-crazy.gif
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Aprig
post Dec 12 2014, 12:37 PM
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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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Asimetric
post Dec 12 2014, 01:09 PM
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In primul rand, nu pot fi primele formatiuni aparute dupa formarea universului. Pentru a exista gauri negre, trebuie sa existe stele, intai.
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Aprig
post Dec 12 2014, 01:39 PM
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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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post Dec 12 2014, 01:46 PM
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Nu exista atata gravitatie intr-o aglomerare de materie incat sa duca la formarea unei gauri negre. Intai se formeaza o stea care, la un moment dat, pentru ca nu mai are energie care sa o tina in "viata", cedeaza sub propria forta de gravitatie.
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Aprig
post Dec 12 2014, 02:13 PM
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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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Yelle
post Dec 12 2014, 04:59 PM
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Hai, ca mai aveti oleaca si nasteti si Universul, ca gestanti sugir sunteti. haha.gif
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post Dec 12 2014, 05:32 PM
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Vorbeam amîndoi despre același lucru, dar la timpi diferiți.


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Yelle
post Dec 12 2014, 06:01 PM
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Care amandoi? Sper ca tu si Asi, ca eu nu numai ca am postat la plesneala, dar n-am nici cea mai mica idee despre ce vorbiti. Despre gauri negre nu stiu decat din Star Trek.
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Asimetric
post Dec 12 2014, 06:08 PM
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You proved me wrong.
Densitatea de materie era atat de mare dupa formarea Universului, incat ar fi posibila formarea unor gauri negre. Asta nu am luat in calcul. Acum, in plina expansiune exponentiala, nu mai e cazul. La asta ma gandeam.
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