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by martinpw
1627 days ago
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> Under this perfect assumption you end up having a problem with the red shift caused by the expansion of the universe (which I didn't account for above) that lengthens the wavelength of the light you want to see, requiring an even larger lens. Redshift does not come into play at the 'small' scale of our galaxy since the Milky Way is a gravitationally bound system that does not itself expand with the Universe. Even within our local group (eg from Andromeda) it is not an issue since the local group is also gravitationally bound. Redshift only becomes an issue at much larger scales, if you are in another galaxy outside our local group. |
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