They are very bright and large spherical objects in the plasma state. At high temperatures they continuously generate their own fuel through the reaction of nuclear fusion. The heat and pressure generated by nuclear fusion prevents gravitational contraction. When the fuel runs out, a star dies and the white dwarf or neutron star is again created by the black hole. The closest star to Earth is the Sun. The reason they shine is because the energy generated by the nuclear fusion reaction at its center travels through the entire interior of the star and is radiated from the outer surface. Almost all elements heavier than hydrogen and helium were produced for the first time in the center of a star.

A star is forming in the region of the Great Magellanic Clouds. NASA / ESA image.
Astronomers can tell the mass, age, chemical composition, and many other religions by observing the star's spectrum, luminosity, or motion. The total mass of the star determines its evolution and final outcome. Other religions are determined by evolutionary history, which includes diameter, rotation, pressure, and temperature. The image obtained by placing the temperature of many stars in a graph opposite their illuminating power is called the Heartsprung-Russell image. The current stage of the star's evolution and its age can be determined through this image.
The star's life cycle begins with a collapsing cloud. These clouds contain mainly hydrogen, although there may be very few rare heavy elements, including helium. When the center of the star is dense enough, the hydrogen nuclei of that center begin to turn into helium. The energy from the remnants of the star is carried out in a mixed process of radiation and convection. These processes prevent the star from collapsing and the energy generated creates a stellar wind that scatters radiation throughout the universe. He died when he ran out of hydrogen fuel between the stars. Death occurs through various processes depending on the mass. However, before death, the star passed through a few more generations, including the state of infertility. Each generation contains more heavy elements than its predecessor. They can be lonely, again two or more they can form a system together. The two usually revolve around each other and getting closer to each other also affects each other's evolution.