Our star will become a white dwarf at this stage. Dwarf Stageīy and by the Sun in the form of the red giant will cool and gravity will make it collapse inward. The Sun will be a red giant for only about 500 million years. The core will become denser and hotter and the Sun will swell in size. After the next five billion years, the hydrogen in the core of the Sun may be used up. Our star (the Sun) has passed five billion years while emitting energy. Our star (the Sun) is dying which is shown in the above figure. This radiant energy is released into space. The matter of a star is converting into energy. A star like the Sun emits light and heat all the time. At this stage of the protostar is called a star. With the passage of time, a protostar becomes hot enough to produce a great amount of energy. Such a ball of the hot matter is called a protostar. the gas and dust particles are packed into a hot spinning ball of matter. A nebula collects more dust and gas during its travel through space. Stars are burn-in the nebula (singular nebula). We have studied that great clouds of gasses and dust are present in galaxies. The lifespan of a star is measured in billions of years. A star is also born, changes, and then dies. Science has told us that the universe is finite, with a beginning, middle, and a future. The life cycle of a stars The life cycle of a star We can also say that light of this star will take 4.2 years to reach the earth. The next closest star Proxima Centauri is 4.2 light-years away from us. It seems that a light-year is a very long distance. A light-year is a measure of distance that light covers in one year with a speed of 300,000 kilometers per second. Instead, we use light-years to express the distance in the universe. Distance s between stars are so great that they cannot be measured in kilometer. They are also at great distances from each other. Which star will look brighter? The near one or farther one? Star Distances: How do we measure the distance to the star? One is near to the earth and the other is very far away from the earth. Now imagine two stars that emit an equal amount of energy. The star which emits a greater amount of energy will seem brighter than the other.
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