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Dam I lost one of those long replies Paul.
I thank you for a well thought out reply.
I cant come up with a specific as to the twin thing I tried once in this forum actually but no one bought it..
Dark matter maybe there no doubt we cant "see" air yet it is there so the fact we cant see it does not by logic exclude it... however could there be alternatives to it ... the search has not been encouraging and ceratinly Hubble has some shots showing why they think it is there...
If there is a real force behind the notion of a cosmological constant maybe that produces an effect we can not yet understand... anyway a situation that we have an alternative to dark matter..
I have been reading as much as I could to day still none the wiser but a nice way to past the day nevertheless
alex
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