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How much larger will the "observable by us" universe be when JWST becomes operational?

Not by very much. You can use an online calculator to convert redshift to distance. Assuming that a redshift of z=11.1 was the most redshifted object found before James Webb, this corresponds to a ...
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Is the dark matter just regular matter out of the observable universe?

Luminous matter outside the observable universe has been considered as a candidate for Dark Flow, i.e. the unexpected motion in distant galaxy clusters independent of the overall increasing expansion ...

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