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After listening to January 8th's podcast, it appears to me that Dominic does not subscribe to the theory that the universe is accelerating as it continues to expand. If there is sufficient energy available to overcome the intergalactic gravitational forces, why should there be insufficient energy to overcome the intragalactic gravitational forces?
Somewhere, (probably on the Naked Scientists' show) I recently heard that, due to the acceleration of the universe, galaxies will eventually disappear from view, because they will have reached (or exceeded) the speed of light, relative to us. I don't know which galaxies were observed to come to the conclusion that the universe is expanding and accelerating. But, according to the web site: http://www.astro.ucla.edu/~wright/cosmology_faq.html#DN, the age of the universe is 14 billion years but the most distant observable objects are 47 billion years distant. However it is expressed, it seems to me that the evidence of acceleration is some billions of years old and there is no way to know what has occurred to the objects observed in that time. For all we know, or can know, they have reversed their acceleration and are speedily catching up with the energy they emitted billions of years ago.
No - but we try and postulate the simplest model that agrees with all the facts.
Quote from: imatfaal on 17/01/2012 09:52:15No - but we try and postulate the simplest model that agrees with all the facts. The fact is that we can't know what's happening right now. We can only know what has happened X years ago with X being the amount of light years between us and the observed object.If we look at a distant earth like planet (say Keppler 22b) and we had the technology to insta-travel there, it's quite possible that there's nothing left of the planet due to a huge asteroid impact or star explosion or whatever..
ImatfaalYou say"take the simplest explanation that fits the facts"As regards the expanding universe, this seems to be mostly based on the Hubble expansion. It requires dark energy to make it work, something that has never been seen and may only exist in the minds of certain people in an effort to justify the standard model.
Time speeding up within the universe would look the same and requires nothing new to be added. This seems to me to be by far the simplest explanation. Ocams razor etc.I believe you will say there is no universal time but I have yet to see a convincing argument to justify that.
Mike - why is light approaching any massive body/bodies gravitationally red-shifted? And that article does not support your assertion.