What is Redshift?

Redshift is a shift in the frequency of electromagnetic wave caused by the movement of the object. The light from the objects that give up from the observer moved their light waves towards the red part of the spectrum. Redshift is commonly observed in astronomy, especially when observing very distant objects. The effect is not limited to electromagnetic radiation to a visible extent, although the term captured, because some retreating astronomical objects looked red.

Redshift is the result of the Doppler effect. Doppler effect applies to sound waves and electromagnetic waves and people often experience daily. The corner of the approaching train sounds higher than when the train moves away, even if the corner itself produces a constant pitch sound. This is because the sound travels at a even speed in the medium - it is the frequency of the sound wave that changes based on the movement of the train. A similar effect of lighting with a lower frequency light resulting from a source that moves in space.

In the visible spectrum of light, low frequency light waves, people are captured as red. High -frequency light waves are considered blue. Therefore, the red shift will result from the light whose source moves from the observer. For example, a galaxy that ranges from the ground at high speed may seem red. Likewise, the approaching galaxy could look blue if its speed was in a certain range.

Although the term redshift means color change, the doppler effect applies to the entire electromagnetic spectrum. Any radiation that is visible to light is one type is shifted based on the relative speed of the radiation source. The astronomical object, which moves with sufficient speed, can "redshift" from the entire visible spectrum - even a trap red. The resulting radiation received by the observer would be in the extent of infrared radiation that is merelythe eye invisible. Thus, astronomers use the term Redshift to indicate any shift in radiation towards a lower frequency.

In the 1920s, the American astronomer Edwin Hubble and others noted that most of the galaxies seemed to be red, with a lot of red shift in proportion to their distance from the ground. Other galaxies were, the faster it seemed to move from the ground. This trend is called the Hubble Law and has provided some of the first evidence supporting the expanding space model that comes from the Big Bang. In explosion, particles of different speeds increase their distance from all other particles. The same applies to the "exploding" universe - all galaxies seem to move from every observer.