- #1
aristurtle
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Now suppose for simplicity that the galaxy,and that its physical diameter was w at the time it emitted the light.find the apparent angular size of the galaxy as it would be observed from Earth today.
the answer given by Mr.Guth seems imply that the galaxy itself is also expanding and point out that objects seen at very large redshifts are seen in a smaller universe so they look unusually large.And he (maybe the teaching assistant)compared the result with the one that only take recession of the galaxy into consideration.
But as far as I know galaxy don't expand with the sapce-time background.I'm quite confused.
the answer given by Mr.Guth seems imply that the galaxy itself is also expanding and point out that objects seen at very large redshifts are seen in a smaller universe so they look unusually large.And he (maybe the teaching assistant)compared the result with the one that only take recession of the galaxy into consideration.
But as far as I know galaxy don't expand with the sapce-time background.I'm quite confused.