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  1. So what does a clock do? It's a very simple...

    So what does a clock do? It's a very simple question, but when you ask around, many of the answers you get are nothing like the reality that you can see with your own eyes.

    I'm not clear what...
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    I'm going to quote a couple of PMs to expose the...

    I'm going to quote a couple of PMs to expose the issue here:



    Physicist is attempting to appoint himself as the authority and the "tutor" for this forum, and absolutely did not see the irony in...
  3. So, does anybody still think that a clock...

    So, does anybody still think that a clock measures the flow of proper time? Or the passage of time? Does anybody still think a clock is some kind of cosmic gas meter with time flowing through it? Or...
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    And when it does, I hereby volunteer to be your...

    And when it does, I hereby volunteer to be your physics tutor. There's a few things I'd like to clear up.
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    Presentism arose in 1908, after Einstein had...

    Presentism arose in 1908, after Einstein had dispensed with the luminiferous aether. But see this and this and this. Einstein reintroduced an aether for GR. And as described in A World without Time:...
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    But that doesn't make sense because the...

    But that doesn't make sense because the block-universe is static. The red streak in the block of movie frames is not in motion.

    No, observation is only compatible with presentism. Spacetime is a...
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    No, I'm not saying that. There are no changes to...

    No, I'm not saying that. There are no changes to the speed of light in the scenario described by SinceYouAsked.

    I mean static is in there is no motion in this arena. Because spacetime is a...
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    I don't think your scenario is correct. Light is...

    I don't think your scenario is correct. Light is moving back and forth inside C's clock, and light moves from C's clock to the A&B point. A and B both see this light, so they agree on the clock...
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    All: PhysBang's post is one long diatribe. IMHO...

    All: PhysBang's post is one long diatribe. IMHO he has no sincere desire to discuss the matter in hand, and is deliberately trying to derail the thread with accusations and argument that other...
  10. PhysBang, your post is all repetition and...

    PhysBang, your post is all repetition and ad-hominem. It's a deliberate attempt to derail the thread and bore other posters to death, so you're on ignore.
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    No. Where do that come from? It isn't relevant....

    No. Where do that come from? It isn't relevant. And nor is anything else you've said. Are you trying to derail the thread?

    You clearly are.

    This thread is about time travel and the nature of...
  12. See this article on the Baez website...

    See this article on the Baez website. It starts by saying this:

    "Einstein went on to discover a more general theory of relativity which explained gravity in terms of curved spacetime, and he...
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    I can't. Neutrinos aren't light. A black hole...

    I can't. Neutrinos aren't light. A black hole isn't light. Dark energy isn't light.

    I just gave you one. A gradual change in position or orientation.

    Everything isn't light. But see A World...
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    I know about Eternalism. I'm the Time Explained...

    I know about Eternalism. I'm the Time Explained guy. The opposing view is Presentism.

    Worldlines don't actually exist. They're abstract things in a static mathematical model. You don't actually...
  15. Because a concentration of energy in the guise of...

    Because a concentration of energy in the guise of a massive star alters the surrounding space. It changes it, it makes it inhomogeneous, and the effect diminishes with distance. As a result of this,...
  16. No I'm not. 2 is 2, it isn't 2m/s, wherein one...

    No I'm not. 2 is 2, it isn't 2m/s, wherein one 2m/s isn't the same as another 2 m/s if the seconds aren't the same. And we know the seconds aren't the same because of the thing we call gravitational...
  17. I'm not peddling bad science. I'm opposing bad...

    I'm not peddling bad science. I'm opposing bad science. Einstein's on my side, remember? And all those other guys. And the hard scientific evidence like the Shapiro delay. In the Fourth Test of...
  18. Yes, that's just about it. That's what...

    Yes, that's just about it. That's what gravitational time dilation is all about.

    Yes. Because of the wave nature of matter. Because of the way you can quite literally make matter out of light in...
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    It isn't true. You don't just perceive incoming...

    It isn't true. You don't just perceive incoming light. Hold your hands up, palms pressed together. There is no space between them, and you can feel your palms touching. Now repeat, but this time with...
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    And those different times are measured on clocks....

    And those different times are measured on clocks. Which feature cogs moving in some regular cyclical fashion. Or crystals vibrating in some regular cyclical fashion. Or microwaves generated in some...
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    Yep. Hmmn. What I'm really saying is that...

    Yep.

    Hmmn. What I'm really saying is that time is motion. Or change. A clock is alleged to measure the passage of time, but actually it "clocks up" some kind of regular cyclical motion and shows...
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    That's circular logic that elevates abstraction...

    That's circular logic that elevates abstraction above reality. Space is empirical. Hold your hands out, there's a space between them. Now waggle your hands. That's motion, that's empirical too. Time...
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    Pretty close. Maybe time is not that which allows...

    Pretty close. Maybe time is not that which allows for motion needs a polish, because time is derived from motion. I can waggle my hands and show you motion. It's empirical. But I can't show you time....
  24. Thread: vortex cannon

    by Farsight
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    I'm not sure Barry. I've seen pictures and videos...

    I'm not sure Barry. I've seen pictures and videos of what is essentially a puffer-box that blows a smoke-ring vortex, but I don't know the dimensions of it. Maybe there's something in here:...
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    What are you on about, lpetrich? Nobody is...

    What are you on about, lpetrich? Nobody is denying spacetime. All we're saying is that it isn't space. You move through space over time. You don't move through spacetime over time, because time is...
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