EVERYDAY SCIENCE

Detailed explanation-1: -For low-mass stars (left hand side), after the helium has fused into carbon, the core collapses again. As the core collapses, the outer layers of the star are expelled. A planetary nebula is formed by the outer layers. The core remains as a white dwarf and eventually cools to become a black dwarf.

Detailed explanation-2: -A star like our Sun will become a white dwarf when it has exhausted its nuclear fuel. Near the end of its nuclear burning stage, such a star expels most of its outer material (creating a planetary nebula) until only the hot (T > 100, 000 K) core remains, which then settles down to become a young white dwarf.

Detailed explanation-3: -The end product of the life of a low mass star, such as our own Sun, is a brown dwarf. This is simply a star that has exhausted its nuclear fuel once it begins to fuse helium into lithium (our own star is currently fusing hydrogen into helium) and can no longer sustain fusion.

Detailed explanation-4: -Eventually, all low mass stars will become white, then black, dwarfs. The matter in white dwarfs is about a million times denser than matter around you, since you have packed the mass of the Sun into the volume of our Earth. (planetary nebulae) Some are spherical, but most have bipolar structure.

Detailed explanation-5: -Explanation: A Black dwarf is Hypothesized as the final stage of the life cycle of a Sun-like Star. When Sun burns all of its hydrogen to helium, its core will shrink and it will rearrange itself, expanding its outer layers o form a Redgiant Star.