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The '''blue shift''' is an [[astronomical]] term used to describe the apparent increase in [[frequency]] that an observer detects due to relative motion between the source and the observer, such that the two are getting closer together.

'''Blue shift''' is an [[astronomical]] term used to describe the apparent increase in [[frequency]] that an observer detects due to relative motion between the source and the observer, such that the two are getting closer together.<ref>{{cite web|url=https://www.space.com/25732-redshift-blueshift.html|title=What Are Redshift and Blueshift?|accessdate=2019-04-02}}</ref> The effect causes objects to appear "bluer" when viewed in the [[visible light|visible]] portion of the [[electromagnetic spectrum]], giving the name. [[Redshift]]ing describes the opposite effect where objects moving away from the observer appear redder.

 

 

[[Category:Astronomy]]

[[Category:Astronomy]]