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If you represented each star by a grain of sand, it would take more than all the sand on all the beaches on Earth to represent all stars in the universe.
What is a star?
An astronomical object known as a star is made up of a bright plasma spheroid that is held together by gravity. The Sun is the star that is nearest to our planet. Other stars are also visible at night with the unaided eye, but because to their great distances from Earth, they appear as stationary points of light. Many of the brightest stars have names, and the most notable stars have been grouped into constellations and asterisms. Star catalogues have been put out by astronomers that list the known stars and offer standardised stellar labels. An estimated 1022–1024 stars are present in the observable cosmos. Even so, the majority—including all individual stars outside our galaxy, the Milky Way—are invisible to the human eye from Earth.
The gravitational collapse of a gaseous bmade largely of hydrogen, helium, and traces of heavier elements results in the birth of a star. The primary factor influencing its evolution and ultimate fate is its entire mass. The thermonuclear fusion of hydrogen into helium in a star's core is what keeps it glowing for the majority of its active life. As a result of this process, energy is released into space and travels throughout the star's interior. A star's core eventually decomposes into a stellar remnant, such as a white dwarf, neutron star, or black hole if the star is sufficiently massive.
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