Cepheid-stars, which are examples of “Standard Candles", are useful to astronomers as indicators of the existence of black holes. distance, particularly to nearby galaxies. white dwarf star behavior. stars with very high speed motion. The Milky Way galaxy is one of many billions of galaxies in the Universe. is unique in the Universe in showing definite spiral structure. contains the whole Universe; everything observable is within its volume. is one of only a few spiral galaxies; most other galaxies in the Universe are amorphous collections of star
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.
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