Plasma with high brightness is a giant sphere held together by gravity. The Sun is the closest star to the Earth, and is the source of most of the Earth’s energy. The stars appear when other atmospheric phenomena are uninterrupted during the night when the sun is absent. Historically, some of the major stars in the sky have been combined to form and subdivide into constellations, which are considered to be birth stars. The most important of these stars have been given special names. Various astronomers have compiled various types of star catalogs. They can be used to determine the exact position of each star. The universe is estimated to have 10 ^ 22 to 10 ^ 24 stars, but most are invisible to the naked eye.
Inside the stars, the fusion process of hydrogen atoms (nuclei) into helium atoms takes place, producing enormous amounts of energy. This creates a lot of energy. This energy radiates heat and light into space. This radiant emission from the sun is the source of the energy needed to sustain life on Earth. Almost all elements heavier than helium are formed by the fusion of stars.
Astronomers estimate the age, mass, and chemical composition of stars by measuring the star’s spectrum, luminosity, and motion in space. Other physical properties of a star are measured by its curvature, diameter, and temperature. The graph that draws the temperature and brightness of the stars on the axes is called the Hertzsprung-Russell diagram. This image is used to study the age and evolutionary history of stars.