As new info is discovered, theories change. Old theories can be revised. Why is this necessary? 1. New scientists need to get credit for their ideas. 2. The process allows for an understanding of the world. 3. Old theories are found on old technology.
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.
As new info is discovered, theories change. Old theories can be revised. Why is this necessary?
1. New scientists need to get credit for their ideas.
2. The process allows for an understanding of the world.
3. Old theories are found on old technology.
After the discovery of new information or invention, the theories can be changed, the old theories can need to be revise, because the new scientists need to get credit for their ideas.
The theories can be changed due to new scientist introduce a new technology, it will be helpful to provide more information about the theory.
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