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Illustrating what I said above, from Open University, here is the Sun's spectrum:

...and a typical spiral galaxy spectrum:

A redshift of z=9 (which is in the middle of where the JWST wants to look) means that wavelengths expand 10x, that is by an order of magnitude, or one tick mark to the right on the horizontal axis of the above diagram.

*Lunatic*, n.
One whose delusions are out of fashion.

by DoDo on Sun Jan 24th, 2010 at 06:24:39 AM EST
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BTW, if anyone is curious what's the possible maximum in redshift: 1089, that's the redshift of the Cosmic Microwave Background, which was a yellowish light when released (the thermal radiation of non-transparent plasma turned transparent gas), but the Universe expanded 1090x since then. However, it took some time from there for the first stars to light up, so the most distant galaxies observable even in theory will have redshifts in the dozens at most.

*Lunatic*, n.
One whose delusions are out of fashion.
by DoDo on Sun Jan 24th, 2010 at 06:32:43 AM EST
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