SOLAR SYSTEM

Detailed explanation-1: -Generally, the more massive the star, the faster it burns up its fuel supply, and the shorter its life. The most massive stars can burn out and explode in a supernova after only a few million years of fusion. A star with a mass like the Sun, on the other hand, can continue fusing hydrogen for about 10 billion years .

Detailed explanation-2: -So for a given star of a particular size, a natural balance is reached between the inward pull of gravity, set by the star’s mass, and the outward push of radiation, set by the process of nuclear fusion in the star’s core. In brief, a star’s size is predominantly set by its own mass.

Detailed explanation-3: -The exact lifetime of a star depends very much on its size. Very massive stars use up their fuel quickly. This means they may only last a few hundred thousand years. Smaller stars use up fuel more slowly so will shine for several billion years.

Detailed explanation-4: -But many stars are not constant. Their brightness varies over time. We classify a star as a variable star if its light, as seen from the Earth, changes in brightness. A variable star is one that’s known to dim and then brighten again.

Detailed explanation-5: -Stars or objects that are closer to Earth, but fainter, could appear brighter than far more luminous ones that are far away. “The apparent magnitude of an object only tells us how bright an object appears from Earth.