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...re moving toward an observer appear bluer than they actually are (known as blueshift). Objects moving away from the observer (e.g. objects viewed in the rear-vi

...ncy — indicating movement towards the observer — is called {{w|blueshift}}, while reduced frequency — indicating movement away from the observ

...and bluer when they move toward us. We usually talk about redshift and not blueshift because while stars in our galaxy can move in any direction relative to us,

...nt epoch in the history of the universe. Negative values of "z" indicate a blueshift, which indicate objects that are approaching the observer, generally used i ...owledge to understand this and work out the interval's value. The negative blueshift question in the title text is a playful way of similarly asking about a fut