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Past exam of the astrophysics course of the University of Oxford / 2015 / 8 / b

Codex (@codex,  0) ... Physics course of the University of Oxford Year 4 of the physics course of the University of Oxford Astrophysics course of the University of Oxford Past exam of the astrophysics course of the University of Oxford 2015 8
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b
A transverse physical size is angle times angular diameter distance, not luminosity distance or comoving distance. Converting the apparent diameter into radians gives
d=5(180×3600π​)DA​=43.8 kpc​.
(1)
This is the galaxy's projected proper diameter at the emission epoch. Its corresponding comoving diameter is three times larger.

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