The members of such stellar groups are physically related through common origin and are bound by mutual gravitational attraction. Many stars occur in pairs, multiple systems, or star clusters. Of the tens of billions of trillions of stars composing the observable universe, only a very small percentage are visible to the naked eye. Star, any massive self-luminous celestial body of gas that shines by radiation derived from its internal energy sources.
In order to maintain stability, the star burns fuel in its core until it is depleted, causing the core to collapse into, depending on whether the star is low- or high-mass, either a dense white dwarf, a neutron star, or a black hole.
Stellar evolution occurs when a star loses its energy from continuous nuclear fusion reactions, causing instability due to decreasing gas pressure.
0 kommentar(er)
