GENERAL KNOWLEDGE

Detailed explanation-1: -Main sequence stars fuse hydrogen atoms to form helium atoms in their cores. About 90 percent of the stars in the universe, including the sun, are main sequence stars. These stars can range from about a tenth of the mass of the sun to up to 200 times as massive. Stars start their lives as clouds of dust and gas.

Detailed explanation-2: -Stars spend about 90% of their lives in the main sequence, because the conversion of hydrogen into helium takes much longer than the fusion of helium and heavier elements. The lifetime on the main sequence depends on the star’s initial mass.

Detailed explanation-3: -Since stars spend roughly 90% of their lives burning hydrogen into helium on the main sequence (MS), their ‘main sequence lifetime’ is also determined by their mass.