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Stars

Stars are cosmic engines that form from nebulae through nuclear fusion, producing light and heat while creating essential elements for life. They vary in size and lifespan, with smaller stars lasting trillions of years and massive stars living only millions of years before exploding in supernovae. The remnants of stars can become white dwarfs, neutron stars, or black holes, and they play a crucial role in illuminating the universe and supporting life.

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6 views1 page

Stars

Stars are cosmic engines that form from nebulae through nuclear fusion, producing light and heat while creating essential elements for life. They vary in size and lifespan, with smaller stars lasting trillions of years and massive stars living only millions of years before exploding in supernovae. The remnants of stars can become white dwarfs, neutron stars, or black holes, and they play a crucial role in illuminating the universe and supporting life.

Uploaded by

borcesavovski
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© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Stars

Stars are the brilliant engines of the cosmos, responsible for shaping the universe and
creating the very elements that make up life. They are born in enormous clouds of dust and
gas called nebulae. When gravity pulls matter together within these clouds, pressure and
temperature rise until nuclear fusion ignites at the core. This is the birth of a star. From that
moment, the star begins to shine, converting hydrogen into helium and releasing energy in
the form of light and heat.

Stars vary greatly in size, brightness, and lifespan. Small red dwarfs burn their fuel slowly,
glowing dimly for trillions of years. Massive blue stars shine with incredible intensity but
live fast, exhausting their fuel in just a few million years. Our Sun sits in the middle, a yellow
star in the main sequence stage, which will last for billions of years.

As stars age, they undergo transformations. When the hydrogen in their cores is depleted,
smaller stars swell into red giants, while larger stars expand dramatically before collapsing
in violent supernova explosions. These explosions are some of the most powerful events in
the universe, briefly outshining entire galaxies. They also create and scatter heavy elements
such as iron, carbon, and oxygen into space—materials essential for the formation of new
stars, planets, and even living organisms.

What remains after a star’s death depends on its size. Smaller stars leave behind white
dwarfs, dense objects about the size of Earth but with the mass of the Sun. More massive
stars can collapse into neutron stars, incredibly dense spheres where a teaspoon of matter
would weigh billions of tons. The most massive stars may even form black holes, regions of
space where gravity is so strong that not even light can escape.

Without stars, the universe would be dark and lifeless. They illuminate galaxies, create the
elements necessary for planets, and provide the energy that sustains life. Every atom in our
bodies was forged inside ancient stars, making us, in a very real sense, children of the stars.
For millennia, humans have looked up at them for guidance, inspiration, and wonder.
Today, scientists study them with powerful telescopes, unraveling their secrets and
deepening our understanding of the universe we call home.

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