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Once you start to get out around cosmological distances, the distances quoted start to become problematical due to time dilation, redshift and spacetime curvature. Several different ways of measuring distance are employed.... light travel time, light travel distance, comoving/proper distance, cosmological proper distance, angular size distance and luminosity distance. They all give different answers as to how far away an object is, with luminosity distances giving the largest of all the values that can be ascertained.
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