Question

we all know that anything burns in the presence of oxygen,Then how does the sun is burning as there is no oxygen available in space.

Answer 1

its gaseous reaction . its not burning

Answer 2

So, the Sun can "burn" hydrogen to helium without the need for oxygen. It should be noted that in the presenceof carbon, nitrogen and oxygen, stars heavier than the Sun may burnhydrogen to helium by using the C, N and O as catalysts. Even in these stars, however, an absence of oxygen does not prevent nuclearburning