Why are the lines in the spectra of distant galaxies shifted towards the red?

Lines in the spectra of distant galaxies are shifted towards longer waves. This phenomenon is called the metagalactic redshift. It is interpreted, according to the Doppler principle, as an increase in the average distance between galaxies. The reason for this is, according to modern views, a huge explosion that occurred 10 – 20 billion years ago and led to the scattering of galaxies. According to new data, the explosion could have occurred at a time closer to us.

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