A star's hydrogen supply runs out because of nuclear fusion in its core. As hydrogen is fused into heavier elements like helium, the star's core temperature increases, causing it to expand and cool. Eventually, the core runs out of hydrogen to fuse, leading to the star's evolution into a different phase.
When a star exhausts its core hydrogen, nuclear fusion in the core stops, causing the core to contract and the outer layers to expand and cool, making the star grow larger. The increase in size is due to the star transitioning into the red giant phase as it starts burning hydrogen in a shell surrounding the core.
The first element that is converted in a star's core is hydrogen. Through nuclear fusion, hydrogen atoms fuse together to form helium, releasing energy in the process. This fusion process is what powers a star and allows it to shine.
A helium flash is a brief event that occurs during the later stages of stellar evolution in low to medium-mass stars (like the Sun). It happens when the core of the star rapidly heats up and ignites helium fusion, causing a sudden burst of energy production. This phase marks the transition from burning hydrogen to burning helium in the core.
core
The rest of the star expands.
its clears air
The core collapses
Its blown into interstellar space - to enrich and mix with the gasses already out there.
When there is no hydrogen left in the core of a star, hydrogen fusion can occur in a shell around the core. This phenomenon is known as shell hydrogen burning and it allows the star to continue generating energy by fusing hydrogen into helium in the outer layers surrounding the depleted core.
Yes, if the star is massive enough when the core collapses a supernova explosion happens.
If the core temperature of a star decreases, it will contract, causing the core to become denser. This contraction may lead to an increase in temperature in the outer layers, causing the star to expand its radius to re-establish equilibrium.
As an average star is dying and the core is contracting when the temperature reaches 100 million Kelvin Helium atoms fuse into
When a star uses the hydrogen in its core it will start burning hydrogen in a shell around the core and become a red giant. After that the star will either collapse into a white dwarf or start fusing helium, depending on its mass.
helium atoms fuse to form carbon atoms in the core of the star
Nuclear fusion, converting hydrogen nuclei into helium nuclei.
The star "burns out" because iron cannot be fused. What happens then depends on the star's remaining mass:low - white dwarfmed. - neutron starhigh - black hole