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Is Time Travel (going backwards) Possible?
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<blockquote data-quote="Umbran" data-source="post: 6041290" data-attributes="member: 177"><p>Well, at the moment we are talking more about dark energy than dark matter.</p><p></p><p>For dark energy: Einstein originally put in his cosmological constant, because he needed the term there in order to make the Universe static (neither expanding nor contracting). Edwin Hubble's observations proved that the universe was expanding - Einstein, given that information, felt the constant was unnecessary to explain the observed phenomenon, so he removed it.</p><p></p><p>It is only more recently that our instruments have become precise enough to measure the not only the expansion, but the acceleration of expansion. So, now with new data, we adjust again, and perhaps but Einstein's constant back in place.</p><p></p><p></p><p></p><p>The acceleration of expansion was first observed in 1998. In the years since, the fact that expansion is generally accelerating has been verified by different groups, using a wide variety of techniques. That the expansion of the visible universe is accelerating is pretty well observed, and not really guesswork at this point.</p><p></p><p></p><p></p><p>Are folks on this forum going to have some remarkable insight that clears up some fundamental issues of physics? Probably not. Can some folks learn a bit about the current thoughts of the universe? Certainly.</p><p></p><p></p><p></p><p>So what?</p><p></p><p>There is "a chance" for just about anything. There's "a chance" that Morrus is actually Elvis Presley. We cannot allow "a chance" that we might be wrong to stop us from trying and thinking. The scientific method not only allows that there's a chance that we might be wrong, it absolutely requires we try anyway. The whole process of science is, in the end, a big trial-and-error game. Error is a major portion of the process, as error often reveals more information than being correct!</p><p></p><p>Beyond science, all of life is a process of taking the best shot with the information and tools at hand. There's a chance that the next job you take will be a really, really bad career move, in ways that you will not be able to see. Do you allow that to paralyze you?</p><p></p><p></p><p></p><p>If you read the actual writing of the scientists involved in those experiments, you'll find that they didn't say they found the Higgs. They said they found a <em>candidate for the Higgs</em>. It has the right mass. It decays in some of the right ways. They'd like to find some of it's other decay modes, and verify its parity, before really claiming it to be a Standard Model Higgs. </p><p></p><p></p><p></p><p>How long you've been looking isn't really a measure though. Mankind was trying to fly for millennia (since Daedalus, at least), and it took the Wright Brothers to get us off the ground. </p><p></p><p></p><p></p><p>See above - the acceleration of expansion in our visible universe is pretty well observed and accepted at this point. The basic way out of invoking something exotic like Dark Energy is to have this be only a local phenomenon. Historically, though, theories that have us living in a particularly special part of the universe have tended to be wrong. </p><p></p><p></p><p></p><p>Yes. And? So what? Is there some preferable alternative?</p></blockquote><p></p>
[QUOTE="Umbran, post: 6041290, member: 177"] Well, at the moment we are talking more about dark energy than dark matter. For dark energy: Einstein originally put in his cosmological constant, because he needed the term there in order to make the Universe static (neither expanding nor contracting). Edwin Hubble's observations proved that the universe was expanding - Einstein, given that information, felt the constant was unnecessary to explain the observed phenomenon, so he removed it. It is only more recently that our instruments have become precise enough to measure the not only the expansion, but the acceleration of expansion. So, now with new data, we adjust again, and perhaps but Einstein's constant back in place. The acceleration of expansion was first observed in 1998. In the years since, the fact that expansion is generally accelerating has been verified by different groups, using a wide variety of techniques. That the expansion of the visible universe is accelerating is pretty well observed, and not really guesswork at this point. Are folks on this forum going to have some remarkable insight that clears up some fundamental issues of physics? Probably not. Can some folks learn a bit about the current thoughts of the universe? Certainly. So what? There is "a chance" for just about anything. There's "a chance" that Morrus is actually Elvis Presley. We cannot allow "a chance" that we might be wrong to stop us from trying and thinking. The scientific method not only allows that there's a chance that we might be wrong, it absolutely requires we try anyway. The whole process of science is, in the end, a big trial-and-error game. Error is a major portion of the process, as error often reveals more information than being correct! Beyond science, all of life is a process of taking the best shot with the information and tools at hand. There's a chance that the next job you take will be a really, really bad career move, in ways that you will not be able to see. Do you allow that to paralyze you? If you read the actual writing of the scientists involved in those experiments, you'll find that they didn't say they found the Higgs. They said they found a [I]candidate for the Higgs[/I]. It has the right mass. It decays in some of the right ways. They'd like to find some of it's other decay modes, and verify its parity, before really claiming it to be a Standard Model Higgs. How long you've been looking isn't really a measure though. Mankind was trying to fly for millennia (since Daedalus, at least), and it took the Wright Brothers to get us off the ground. See above - the acceleration of expansion in our visible universe is pretty well observed and accepted at this point. The basic way out of invoking something exotic like Dark Energy is to have this be only a local phenomenon. Historically, though, theories that have us living in a particularly special part of the universe have tended to be wrong. Yes. And? So what? Is there some preferable alternative? [/QUOTE]
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