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Sectiunea Astronomie - Soare, despre astrul nostru
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Sectiunea Astronomie - Soare, despre astrul nostru
pagina are la baza un material trimis de Carapali



Soarele
Ca orice astru, Soarele este o imensa sfera gazoasa exploziva. In interiorul sau, mici particule, numite atomi de hidrogen gazos se unesc pentru a forma un alt gaz numit heliu. Acest proces de unire se numeste fuziune nucleara si elibereaza cantitati uriase de caldura si lumina. Aceasta este raza solara. Fara ea n-ar ezista viata pe Pamant.


Marimea Soarelui
Soarele are diametrul de circa 1,4 milioane de km (875.000 mile). In interior ar putea gazdui un milion de planete de marimea Pamantului. Dar in comparatie cu marimea altor astri din Univers, soarele nu este mare deloc.


Petele Solare
Suprafata Soarelui este marcata uneori de petice mici, intunecate, numite pete solare. Petele solare sunt zonele de pe Soare mai reci decat suprafetele vecine. Ocazional, petele solare se grupeaza si devin enorme. Cel mai mare grup vazut vreodata acoperea o arie de 18,130 milione de km patrati.



Gaze stralucitoare
Petele solare sunt adesea inconjurate de nori de gaze stralucitoare care plutesc in stratul exterior al Soarelui. Acestea se numesc facule. Inele uriase de gaze, numite protuberante, se ridica de pe suprafata cu viteze ce ajung la 6000 km pe secunda. Ezploziile radiatiilor numite scanteie solare sunt si mai spectaculoase si mai violente.
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