Astrophysics (Index)About

standard ruler

(astronomical phenomenon whose size can be determined)

A standard ruler is any type of astronomical phenomenon with a size or distance across the sky that can be determined, in absolute units (e.g., parsec) rather than arcseconds. If its distance can be determined by other means as well (such as using the redshift with Hubble parameter) the two can be compared and suitable corrections can be devised. Standard rulers are useful for construction of cosmic distance ladders. baryon acoustic oscillations are considered a type of standard ruler.

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Referenced by page:
baryon acoustic oscillations (BAO)