Redshift and blueshift: What do they mean?

Redshift and blueshift describe the change in frequency of light waves depending on whether an object is moving forward or away from us. When an object moves away from us, the light from that object is called redshift, and when an object moves towards us, the light from that object is called blueshift.

Astronomers use redshift and blueshift to infer how far an object is from Earth, a concept that is key to charting the expansion of the universe.

https://www.space.com/25732-redshift-blueshift.html Redshift and blueshift: What do they mean?

Chris Estrada

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