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On Wed, 29 Sep 2004 19:17:51 +0100, "George Dishman"
wrote: "vonroach" wrote in message .. . On Tue, 28 Sep 2004 18:59:07 +0100, "George Dishman" wrote: "vonroach" wrote in message .. . On Sun, 26 Sep 2004 15:57:41 +0100, "George Dishman" wrote: Complete utter nonsense. Actually, I love that reply, the values weren't measured, they were just assumed because nothing else fits the observations. George A common practice in science. Newton's entire workable theory of gravity for example. So you think Newton never _measured_ the acceleration of gravity to be 32 ft/s^2, he only _assumed_ it had that value "a posteriori" in order to "justify" the measurements that a dropped item increased its speed by 32 ft/s in each second? George He measured what he attributed to the mutual attraction between two masses - a guess, since he had no other explanation to offer. I don't disagree with that, it was a conjecture and as you say a very workable one. However, what Marcel said was that the _value_ of Omega M had not been measured, instead "assumptions were made a posteriori in order to justify the observations." How else do you make any measurement in astronomy but "assume" a value that fits the observations ;-) Dunno, never thought about it one way or the other. I wonder if something may one day be found in the dark part of the universe that may change our views again. I certainly hope so, we know QM and GR don't mesh easily, and dark matter and dark energy aren't necessarily black, they are dark in the sense of being as yet unexplained. We still have a lot to discover. `Dark' in the sense of being inaccessible to our senses at this juncture. Assumed to be there a posteriori to fit our ideas about the universe which are frequently revised. I confess that I've never actually seen space or time, but I assume a posteriori that they are there to explain observations - motion and aging. Others offer convincing theories that only energy processes exist - all the rest are our assumptions and fantasy. George |
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