![Red shift and blue shift in astronomy. Diagram of the Doppler effect, the change in the wavelength of radiation due to the motion of a source (galaxy Stock Photo - Alamy Red shift and blue shift in astronomy. Diagram of the Doppler effect, the change in the wavelength of radiation due to the motion of a source (galaxy Stock Photo - Alamy](https://c8.alamy.com/comp/2ADMEFT/red-shift-and-blue-shift-in-astronomy-diagram-of-the-doppler-effect-the-change-in-the-wavelength-of-radiation-due-to-the-motion-of-a-source-galaxy-2ADMEFT.jpg)
Red shift and blue shift in astronomy. Diagram of the Doppler effect, the change in the wavelength of radiation due to the motion of a source (galaxy Stock Photo - Alamy
![If cosmological redshift has nothing to do with the Doppler effect, how do we know that galaxies that are very far away are also receding from us? - Quora If cosmological redshift has nothing to do with the Doppler effect, how do we know that galaxies that are very far away are also receding from us? - Quora](https://qph.cf2.quoracdn.net/main-qimg-323c4c62ab83ad7f4abdeab693e11c7b.webp)
If cosmological redshift has nothing to do with the Doppler effect, how do we know that galaxies that are very far away are also receding from us? - Quora
![Doppler shift spectrogram computed from data recorded in Taiwan by the... | Download Scientific Diagram Doppler shift spectrogram computed from data recorded in Taiwan by the... | Download Scientific Diagram](https://www.researchgate.net/publication/300083159/figure/fig1/AS:355530511011840@1461776487197/Doppler-shift-spectrogram-computed-from-data-recorded-in-Taiwan-by-the-receiver-Rx1-on.png)