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Everything posted by SciTechPress

  1. Remarkably, the question cannot be answered. Einstein's theory of relativity gives the rate of time in any "inertial frame" relative to that in any other inertial frame. (Inertial frames are traditionally called Lorentz frames, after the person who first introduced the transformation.) According to relativity theory, there is no inertial frame that travels at the speed of light. Therefore, according to our current theory, the question is fundamentally unanswerable. What we can say is this: compared to an Earth-bound clock, the clock in a frame moving at velocity v progresses at a slower rate. In the limit as the frame velocity approaches the speed of light, that rate approaches zero. But that does not mean that the value at c is zero. To do that, mathematically, you must first show that the limiting situation exists. According to relativity theory, it does not. Some future theory might give a different answer, but in the present day, no alternative to relativity theory has made predictions that show it to be correct. - Richard Muller, Prof Physics, UCBerkeley, author of "Now-Physics of Time" (2016)
  2. Entire universe squeezed into one image..... But the shape?
  3. Even our most faint early radio signals have probably not made it past the Oort Cloud ... much less to other galaxies.
  4. A common misconception is that light travels at different speeds through different mediums. People say that the speed of light in a vacuum is cc, and then say that the speed of light through glass is slower than cc. This simply is not true. The speed of light is always cc. Then why does it take longer for it to travel through glass? Experiments show that light "moves about 200000 km/s through glass" (as opposed to 300,000 km/s through a vacuum), so how could the speed of light be constant?Because of this little thing called interaction.Imagine you are receiving a prize, maybe for writing a great paper about physics. As you walk from point A to point B, you take 2 steps every second. The walkway, being 60 steps long, takes you 30 seconds to get from A to B. Your pathway looks like this. Pretty simple right? I would think so. But let's say you didn't win the prize just by yourself. Some people also helped. In this case, you might want to thank your contributors as you walk to the prize. If you walk at a speed of 2 steps a second, it takes you 120 seconds now to get from the same point A, to the same point B. How is this possible? Both times you were walking at 2 steps a second, yet it took twice as much time as before? Well, let's take a step back and look at the picture. Well that explains it. You were moving both times at 2 steps a second, but you interacted with other external things.Now, let's substitute you for light, the walkway for glass, and the contributors for glass molecules.No matter what, light is always moving at cc. The speed of light does not change in a vacuum, but the time from point A to point B does change, depending on what interacts with the light.So in short, no, light does not change speeds depending on the medium it travels through. The speed of light is always cc. - Ignacio Cabero
  5. ... Yes.. I know... both... BUT ... have we made any progress in our understanding beyond that?
  6. The following images were taken near Roatan, a Caribbean island in Honduras by photographer Caroline Power, and show a sea of plastic glued together, floating like a massive turf in the middle of the ocean. The area where the images were taken is usually compared to paradise, although based on these images it looks anything but that at the moment. Who should we blame? The answer is simple: Society and our way of life. The images show just how bad pollution is, not only in the Caribbean but in many other places around the globe. The worst part is that itÂ’s not only unappealing to the eye, but itÂ’s also threatening to kill off marine life due to irreparable damage done to the environment. The images taken by Power were taken as she and her dive team set out to explore the Caribbean when they encountered a floating island of garbage that stretches for a staggering five miles. As they made their way through the patch of floating rubbish, they encountered everything from plastic bottles, soda cans, televisions, and shoes. Ms. Power went on facebook and posted the images with a post titled: “THIS HAS TO STOP. Think about your daily lives. “How did you take your food to go last time you ate out? How was your last street food served? Â

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