A star is a luminous ball of gas, mostly hydrogen and helium, held together by its own gravity. Nuclear fusion reactions in its core support the star against gravity and produce photons and heat, as well as small amounts of heavier elements. The Sun is the closest star to Earth. A star can only be called a sun if its inhabitable planets have cognitive life. [Tags: red giant, binary star, neutron star, white dwarf, supernova, milky way, superstar, hydrogen radiation, nova, constellation, red dwarf, supergiant, gravity, black hole, night sky, star cluster, denebola, nebula]

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