Have astronomers ever observed a violet shift like they have blue shifts and red shifts?

Redshift - Wikiwand

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How is 'red shift' ascertained from a digital photograph such as a

What is a red shift, and how do we know about it? - Quora

天文学家是否观察过“紫移”，它和蓝移有什么联系- 知乎

Astronomical Redshift Imaging the Universe - The University of Iowa

R.I.P. Expanding Universe (b. 1930, d. 2012)

Redshift and Distance in the Expanding Universe

17.4 Using Spectra to Measure Stellar Radius, Composition, and

Spectroscopy – Stargazer Rock

What is red shifting and blue shifting? Can one see the shifted

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