91影视

The special theory of relativity, sometimes known as special relativity, is a physical theory that describes how space and time interact. Theoretically, this is known as STR theory.

When a light source moves away from an observer, the wavelength of the light seems to be longer than the initial wavelength of the source. This is referred to as red shift.

The blue shift occurs when a source moves closer to us and the wavelength of the light seems shorter to us than the initial wavelength produced by the source of the value\({\rm{s}}\).

Therefore, a source of light moving away from the observer and it鈥檚 wavelength seen loner than the initial is known as red shift.

A source moving close and the wavelength is shorter than the initial is said to be the blue shift.