" Stars are bright, hot, rotating masses of
gas which emit large quantities of light and heat as a result of nuclear
reactions. Most newly-forming large stars begin to collapse under the
weight of their own gravitational pull. That means that their centres are
hotter and denser. When the matter in the centre of the star is sufficiently
heated-when it reaches at least 10 million degrees Celsius (18
million degrees Fahrenheit)-nuclear reactions begin.56 What happens
inside a star is that with enormous energy (fusion), hydrogen turns into
helium. Nuclear fusion takes the particles that make up hydrogen and
sticks them together to make helium (1 helium atom is made from 4
hydrogen atoms). In order to make the protons and neutrons in the
helium stick together, the atom gives off tremendous energy. The energy
released in the process is radiated from the surface of the star as light
and heat. When the hydrogen is consumed, the star then begins to burn
with helium, in exactly the same way, and heavier elements are formed.
These reactions continue until the mass of the star has been consumed.
However, since oxygen is not used in these reactions inside stars,
the result is not ordinary combustion, such as that takes place when
burning a piece of wood. The combustion seen as giant flames in stars
does not actually derive from fire. Indeed, burning of just this kind is
described in the verse. If one also thinks that the verse refers to a star,
its fuel and combustion without fire, then one can also think that it is
referring to the emission of light and mode of combustion in stars.
(Allah knows best.) "

― Harun Yahya , Allah's Miracles in the Qur'an