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Everything posted by michel123456

  1. What are you listening to right now?

  2. Musk's Tesla to stay in space for millions of years

    I wonder. What is the purpose of the circuitboard?
  3. Musk's Tesla to stay in space for millions of years

    Thank you for the info. But you don't need an entire car to hold this: (image from https://medium.com/arch-mission-foundation/arch-mission-foundation-announces-our-payload-on-spacex-falcon-heavy-c4c9908d5dd1
  4. Musk's Tesla to stay in space for millions of years

    Does anyone know if the Tesla is full equipped? Or is it a simple empty body, or hiding some other kind of device? The message “Made on Earth by Humans” printed on a circuitboard is not (I suppose) a standard feature of all Teslas.
  5. There may be confusion between 8.000 ago and 8.000 BC. There is a 2.000 years gap between the 2 figures. Also I thought I knew that agriculture started somewhere in Mesopotamia. In the British islands it must be much more recent.
  6. What are you listening to right now?

  7. What are you listening to right now?

  8. What are you listening to right now?

  9. What are you listening to right now?

  10. What are you listening to right now?

  11. Length Contraction

    Is it an established fact that objects are 4D? Can't you interpret Relativity with 3D objects diving in a 4D continuum?
  12. Is the Hubble Shift a relativistic illusion?

    The part Bolded by me. You could use your math skills to explain why the spiral galaxy is spiral. Maybe using the equations together with some principle, like the principle of minimum energy, or the principle of least action. That would be nice.
  13. Is the Hubble Shift a relativistic illusion?

    If you are correct, doesn't that mean that what we call the Big Bang is in fact a relativistic illusion? A phenomenon that appears for any observer in the Universe, no matter where he is, no matter when?
  14. I stumbled upon this ancient time-keeping device,The Chandelier Clock of Ibn Yūnis , The principle is simple, each lamp is burning a certain amount of time. You have to put in each lamp a specific quantity of oil in order to burn, the first for 2 hours, the second for 4 hours etc. With the subtility that in antiquity (& medieval times) the hour was not standard but it was a portion of daytime. When the day was short, the hours in sunlight were short & in night time were long. Here below the description of the object And here a couple of images I am seeing that the lamps are not at the same height. i see they are all connected (for same air pressure? I don't understand the central container and the tubes that join the one with the other. Has anyone an idea? Thanks
  15. The time keeper chandelier, how does it work?

    OK The bottles are connected with a circular pipe. The bottles are placed at different height, low and lower at regular interval. They cannot be moved because there are 2 openings in it for the horizontal pipe. It looks to me the horizontal connecting pipe plays the role of communicating vessels. In this case the pink oil in the lamps is too low in the pictures, it should go over the horizontal pipe. That would mean that the system is designed in such a way that all lamps have the same level of oil when filled. The lamps will burn a different amount of oil (and time) because the lamps are positioned at different height. Now we have the radial pipes. Are they pipes? Or simply a structural hanging system. The fact that the same configuration, with a central "tank" is common to both pictures (and to a 3rd not posted here) makes me think that the radial system is made up of pipes. It means each bottle has 3 side holes (2 for the horizontal pipes + 1 for the radial) It looks like the oil filling procedure is done by filling the central tank. The oil flows by gravity from the central tank into the bottles, equally filled because of the communicating vessel effect. But then, why are the radial pipes connected to the central tank at mid height and to its bottom? Is this a kind of decantor? How do you open the central tank? (it is hanged) Do you need to take the whole chandelier down? If one fills the central tank, it may happen that the quantity inside the bottles gets much higher than expected. There is no apparent system to regulate the quantity of oil in the bottles, only that the quantity is the same. IOW if I understand clearly the system is made to regulate the gap between the extinction of the bottles. It determines a duration, but does not determine when this duration will begin. Any comments? And when you fill the system, How does the air go out? I mean, the air that is in the closed bottles, does it go out through the cap of the bottle?
  16. Welcome to the upgraded SFN

    What is the LeaderBoard? http://www.scienceforums.net/leaderboard/
  17. What are you listening to right now?

  18. What are you listening to right now?

  19. What are you listening to right now?

  20. What are you listening to right now?

  21. What are you listening to right now?

    the best song ever https://en.wikipedia.org/wiki/Steve_Biko
  22. At the same time

    a. Can one object be at 2 different points of space ? The answer is Yes it can, but not at the same time. Meaning that the same object A can be at point 1 at time stamp T1 and at point 2 at time stamp 2. It cannot be at 2 different points 1 & 2 at the same time. That was for Space. Now the new question: b. Can an object be at 2 different points of time ? The answer is Yes it can. But not at the same time The underlined condition looks like a tautology. Of course an object cannot be at 2 different points of Time "at the same time". Which means that IF an object is at time stamp T1, it cannot be "at the same time" at time stamp T2. Or, because the "at the same time" is tautologic when speaking about Time, what one could say is the following: If an object is at time stamp T1, it is not at time stamp 2. And if the object is at time stamp T2, it is not at time stamp T1. IOW time stamps are mutually exclusive. Is anything wrong in the above?
  23. Today I Learned

    Not today, but recently I learned why some mummies look like screaming. After some post on FB from a friend of mine about the Phaleron mass grave. An archaelogist wrote: I just wanted to make a small comment, with regards to the jaws and postmortem opening, from a biological perspective. Since mandibles are attached to the skulls by joints and two muscle types (masseter and pterygoid), after death, these parts are lost, so mandible drops and gives that "terrified" look. See also http://archive.archaeology.org/online/features/screaming_mummy
  24. At the same time

    1. You are presupposing that the reality is "a loaf of bread". 2. In your example, the loaf of bread xists only when you cut it. Before cutting, there is no loaf, there is the entire bread. 3. The loaf & the bread are static things. Our world is dynamic. What I say that if you put a pen on your desk, this pen is what it is, it is a 3D object. It is not a 4D entity that stretches into the past. There is no bread of pen, and your pen is not a loaf cut from something bigger.
  25. At the same time

    Silence is gold