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[1] the nearest star to earth is the sun As you read the following pages, you'll find out even more about what you can see in the night sky. Many other stars are visible to the naked eye at night
Their immense distances from earth make them appear as fixed points of light. If you have read how the sun works, you already know a lot about the nature of earth's nearest star Of the tens of billions of trillions of stars in the observable universe, only a very small percentage are visible to the naked eye.
At the beginning of the end of a star’s life, its core runs out of hydrogen to convert into helium
The energy produced by fusion creates pressure inside the star that balances gravity’s tendency to pull matter together, so the core starts to collapse. A star is a huge sphere of very hot, glowing gas Stars produce their own light and energy by a process called nuclear fusion Fusion happens when lighter elements are forced to become heavier elements
When this happens, a tremendous amount of energy is created causing the star to heat up and shine Stars come in a variety of sizes and colors. In a very broad sense, a star is simply one of those twinkling points of light you can see in the night sky But that’s not terribly satisfying in either lexicological or physical terms.
These large, swelling stars are known as red giants
But there are different ways a star’s life can end, and its fate depends on how massive the star is. The simplest way to describe a star is that it is a great ball of fire, but it is more complicated than that A star is a giant ball of hydrogen turning into helium through nuclear fusion. The protostar continues to collapse until nuclear fusion begins in its core, leading to the formation of a stable star
This stage is known as the main sequence, where the star burns hydrogen into helium. Where do stars come from Every star forms in a huge cloud of gas and dust Over time, gravity causes the cloud to contract, drawing the gas closer and closer together
As more gas accumulates at the center, it becomes denser and pressure increases
This causes it to heat up and begin to glow.
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