Stellar evolution
We may see thousands of stars in the dark sky. Our universe consists of billions of stars. Stars may appear tiny to us but they are huge balls of gasses. Sun is a star of average size. Some stars are even a thousand times larger than the sun. The stars do not exist forever they have a certain lifetime. The life span of the sun is about 10 billion years. The star undergoes various changes during its lifetime, this process is called stellar evolution. The structure of the sun-like star is shown below.
Red Shift
It is an astronomical phenomenon. In this phenomenon, increase in wavelength with corresponding decrease in photon energy and frequency of radiation of light. It is the displacement of spectrum of any kind of astronomical object to the longer wavelengths (red) side.
![Put the steps of the life cycle of a star in order.
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Lighter elements are depleted and the star becomes a red giant
As hydrogen is depleted, the star fuses helium atoms
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Helium is exhausted; larger stars collapse to a white dwarf, while smaller stars become red supergiants
Red supergiant makes heavier elements up to copper
Star is formed from gas cloud (nebula)
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Star converts hydrogen to helium in fusion reaction
Red supergiant makes heavier elements up to iron
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Helium is exhausted; smaller stars collapse to a white dwarf, while larger stars become red supergiants
Fusion stops, and the core collapses violently, causing a supernova (star death)
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