Comments by "robheusd" (@robheusd) on "World Science Festival" channel.

  1. He forgot to mention the 4-th option, that we all live in a yellow submarine.
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  2. add to that ... Space is the thing that prevents everythingh from happening at the same location.
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  3. Yes... The communication with GPS satelite uses (amongst others) relativistic effects (time-dilation) due to the relative motion and the difference in gravity field - but don't forget one big other factor in GPS is the density of the outer layers of the atmosphere and which necessitates corrections for the difference in speed of light through different dense mediums..
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  4. The whole idea of a Holographic Universe breaths the spirit of Platonism. btw. I have seen better panel discussions on the World Science Festival then this, the debate with Turok, Steinfeld, Guth and Linde about the multiverse was much better I think, even with the same host. Maybe he just had a bad day or so?
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  5. No, although the sun does have a little influence on the orbit of the moon around the earth..... And perhaps you also know the sun has influence on the tides on earth, if the sun and moon are in conjunction to each other, the tides are higher.
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  6. You can ask the question where does the universe - where does everything in existence - come from, but hopefully you already realised this question does not bring you very far, because any existing thing that could provide an answer to that should and is already contained in the term Universe, so there is no real answer to that. Or, we could say, there are only two solutions, either the universe exist eternally (past and future eternal) or the universe came from nothing. But I don't think the universe can have come from nothing.
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  7. There must be a physical explenation for why rooms tend to become messy over time, it must be a fundamental law of the universe - Entropy?
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  8. Exchange of photons, but to know how that works you need to study quantum field theory.
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  9. George Ellis just got the wrong idea of the infinite, because it is trivially true that any physical measurement of time space or whatever will always yield finite values, so we will therefore never measure directly some physical entity to be infinite, his conclusion that therefore the infinite is not part of science is incorrect. The "measurable infinite" is a contradiction in terms. The correct idea is this: imagine a time line without begin or end. Now we place two points on the timeline at any arbitrary locations. The measurement, no matter how far away we place the points apart will alway be a finite measure of time. The infinity of the timeline itself however is only evident by the fact that no matter where we placed our two points, we can always place them further apart. On a finite timeline, such would not be the case.
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  10. ehhh... Did nobody notice the appearent contradiction of this example of the two light clocks? We are speaking about RELATIVITY here, that is (galilean) relative motion! Which one is the moving clock, and which on the stationary? There is no way to decide that, so if one clock moves slower then the other, it would mean relativity is false and motion is absolute. Hence: contradiction! Why is that point not made, and explained that the the slowing of clocks is itself relative, thus dependend on which reference frame one takes. If we view the same scene from the point of view of the rightmost clock, then the left clock is moving and slowing down...
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  11. Ekpyrotic!
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  12. You had better worded this as follow: any meausurement of time is always finite, but this measurement of time, as time progesses io the future, will grow without bound.
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  13. That is not free falling, You would experience the force of gravity PLUS the upward acceleration, just like astronauts experience on their ride to space.....
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