What is the fuel of a star?
Stars shine by burning hydrogen into helium in their cores, and later in their lives create heavier elements. Most stars have small amounts of heavier elements like carbon, nitrogen, oxygen and iron, which were created by stars that existed before them.
Do stars run out of fuel?
Star Life Cycle. Once a star has exhausted its supply of hydrogen in its core, leaving nothing but helium, the outward force created by fusion starts to decrease and the star can no longer maintain equilibrium. The force of gravity becomes greater than the force from internal pressure and the star begins to collapse.
Can stars refuel?
It will increasingly become a large core of helium, carbon, nitrogen, oxygen, etc. That means that the end of the main sequence is unavoidable over time. Shell burning would occur, shedding mass. Refilling the shed mass would still be shell burning.
Do stars have gas?
A star is a huge glowing ball of hot gas. Deep inside its core, hydrogen atoms smash together, forming helium and releasing huge amounts of energy that heats the gas. This is called nuclear fusion, and it's why a star shines. As the hot gas pushes outward, it opposes the inward pull of gravity.