This is called red-shift. Light is shifted towards the long wavelength, red end of the spectrum. This tells us that: other galaxies are moving away from our galaxy; the Universe is expanding.

Galaxies in the early universe tend to be clumpy, but the new JWST discovery of a "grand design" spiral galaxy just 1.5 ...

The instrument has detected galaxies whose redshift is so extreme that they are thought to have been formed within 300 million years of the Big Bang. This unassuming red blob is Maisie's Galaxy ...

They had measured the redshift of the galaxies to be over 16, implying that these galaxies existed just 200 million to 250 million years after the Big Bang. Yet they were gigantic and appeared to ...