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Okay Alex, I get your point.
The condensate is optically dense and as such will significantly slow the passage of light whilst travelling through the condensate.
However, for us to say that M31 is closer than we think is pushing it a bit far. This would imply that the greater part of space is condensate.The temperature in space is about 2 degrees kelvin and the condensate requires absolute zero. Perhaps when the universe expands a bit more and the temperature gets to zero absolute then we can expect a proliferation of condensate.
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