LLH 發表於 2007-9-12 01:05:14

理論天文組討論題目8

Harrison – Cosmology, Chapter 15, Project 5

Can you understand how it is possible for bodies at large redshift to be nearer to us at the time of their emission than bodies of lesser redshift?Two quasars have redshifts of 1 and 3, respectively; which of the two is closer at the time of emission?
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