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Glavni niz

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Hercšprung-Raselov dijagram

Glavni niz predstavlja niz zvezda koji prelazi kao dijagonala (od levog gornjeg dela ka desnom donjem delu) preko Hercšprung-Raselovog dijagrama. Na glavnom nizu se nalaze zvezde koje su u centralnoj fazi svoje evolucije, odnosno faza u kojoj se odigrava fuzija vodonika u helijum u jezgru zvezde. Na glavnom nizu se nalazi velika većina do sada uočenih zvezda, kao i Sunce.

Najpre iz oblaka međuzvezdanog gasa nastane gravitacionim sažimanjem protozvezda, a kada se protozvezda dovoljno sažme i u njenom jezgru se počnu odvijati termonuklearne reakcije, zvezda započinje svoj život i penje se na glavni niz. Kada potroši svoje nuklearno gorivo (vodonik) zvezda silazi sa glavnog niza i zavisno od svoje mase postaje beli patuljak, pulsar ili crna rupa i zauzima svoje novo mesto na Hercšprung-Raselovom dijagramu.

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Glavni niz
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