Because the galaxies are moving away from us, the light they emit is shifted toward the shorter, blue wavelengths. is shifted toward the longer, red wavelengths. is of the same wavelength it would be if they were at rest relative to the earth. arrives with increased intensity
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.
Because the galaxies are moving away from us, the light they emit
-
is shifted toward the shorter, blue wavelengths.
-
is shifted toward the longer, red wavelengths.
-
is of the same wavelength it would be if they were at rest relative to the earth.
-
arrives with increased intensity
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