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Stars are celestial bodies that emit light caused by nuclear fusion reactions that produce energy in their core. [1] It should be noted that 'pseudo stars' are not stars, but planets that reflect light from other stars and appear to glow in the sky like a star. According to astronomy , the definition of a star is: All massive objects (masses between 0.08 and 200 solar masses ) that are currently and have ever produced energy through nuclear fusion reactions . Therefore, white dwarfs and neutron stars that are no longer producing energy are still called stars. The closest star to Earth is the Sun at a distance of about 149,680,000 kilometers, followed by Proxima Centauri in the constellation Sentaurus , about four light years away . The stars have become a part of every culture. The stars were used in religious practices, in navigation , and in farming . The Gregorian calendar , used in almost all parts of the world, is a solar calendar , basing itself on the position of the...