Yes. Only slowly. But stars are very big, so lots of hydrogen gets converted.
Yes it is very hot and filled with mainly hydrogen
All stars will have some helium in their cores, depending on the type of star.
This star become a red giant - the first step to degeneration.
12 hundred but the stars has finished burning hydrogen well but hydrogen can not be finished ever ever because hydrogen is like air, oxygen .
No. Stars that have depleted the hydrogen in their cores may start fusing heavier elements.
Light elements are made in light weight stars via stellar nucleosynthesis. Elements as heavy as iron form in the cores of massive stars. Anything heavier than iron requires a supernova--the collapse and explosion of a super massive star.
90% of all stars are at mid-life where their cores are fusing hydrogen into helium.
For main sequence stars, the vast majority is hydrogen and helium. Older stars will exhaust these lighter elements near their cores and begin fusing heavier elements.
White dwarfs are the cores of dead stars that have been crushed into an extremely dense state by their own gravity.
High-mass stars
Basically all stars do that.
Carbon is formed in the cores of stars and distributed into space during the death of stars.
The cores of stars and hydrogen bombs.
In the cores of stars and hydrogen bombs.
Some stars do not develop degenerate helium cores.
Oxygen is made all the time in the cores of stars.
. . . in the cores of stars and thermonuclear weapons.
Oxygen was created by fusion in the cores of stars and distributed through the universe when those stars exploded.
Oxygen was created by fusion in the cores of stars and distributed through the universe when those stars exploded.
Gold is an element that is formed in the cores of stars; it is not organic and does not grow.
Like most elements, selenium was formed in the cores of stars.