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Arjun Artro

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Posts posted by Arjun Artro

  1. I've been thinking about gravity and its curving effect on spacetime. It seems very strange to me that a massive object can warp space and time around it. I have a few questions:

    1. Would a magnetic field as strong as the gravity around a black hole bend the spacetime around it? If so, it's the bending effect same as that of gravity?

    2. If gravity is a curvature in spacetime, and not a force, why doesn't the centre of an object experience the same curvature? (for eg, Fg=0 at the centre of the earth)as I thought it is because the forces cancel out each other at the centre.

  2. Okay that's for locating an object. And I agree that dimensions are needed for that just like the latitude and longitude of the earth. But we never use the terms like "a latitude object" , a "longitude object" like we call 2d object, 3d object etc. I might be wrong, but imagine this- suppose there is another world which is 2 dimensional. And the projection of a 2d surface is a "line" right? Suppose there are two lines - red and blue. How would you know that one is red and the other is blue if those lines only have length and no width (even if it is negligible, width cannot be equal to zero) . Am I right?

  3. I wanted to learn about 4d space and got curious why I cannot visualize it so I searched in the internet for some answers. I am not satisfied by how it is explained, especially the flatlander's theory. First of all, how can a 1d or 2d object exist? Lets take 1d for an example. Its called 1d because it only has length and no width. How can you see a line that has no width, even the slightest width and the slightest height? Okay, 3 dimensions might be needed to do the math but in reality , are dimensions real? And our theory about 4d, 9d and 25d might be just helping quantum physics and string theories but I dont think it's actually there.

  4. The expansion of space is accelerating, space is expanding faster than before. From the supernova obsservation that is a fact.

    What I don't understand is why do we need dark energy to explain that acceleration, when ther is a simple explaination:

    Gravity is opposed to space expansion. Space expansion happen when gravity is not strong enought like between galaxy cluster. Earlier in the cosmos history cluster where closer together and gravity between cluster was bigger because of smaller distance, but not close enought so the space expansion brought these cluster further apart. If the distance between cluster increased, then the gravity between them decreased, so there was less force acting agains the space expansion giving a net increase in space expansion.

     

     

    Okay let's assume that space is expanding when gravity is not strong enough to pull objects together.

    But why does gravity lose its grip with time? It's been billions of years since big bang and there's no other force that push objects away . So there must be some sort of energy that overpowers gravity.

  5. Lucid dreaming is a technique by which we can control our dreams with practise and certain sound waves. I've tried it and have once succeeded in doing it. I've read that dreams just last for about 2 seconds and that it is made up by our sub conscious. If so, how can these people or even myself control these scenes and stuff that show up just for a couple of seconds? What is the science behind this? And does dreams have solid scientific base? Does anyone have a clear idea about this?

  6. Imagine a spaceship traveling at 99% speed of light. Inside the capsule there is a gun. when it fires, space time will be warped so that the time around the bullet is reduced to such an extent that it doesn't break the speed limit. But what if instead of a gun, a flashlight was lit?

    Would it emit light like usual?

  7. Infinity is just a word to cover up or hide all the loopholes these "experts " make when making theories. The Big Bang is an assumption. As no one is able to "prove " it wrong, it has taken its place in science to a very big extent. Nothing observable by our senses can be finite. In other words, we make these scales and we measure it. What if we're wrong somewhere? We humans never admit it. .

  8. Human mind is still a mistery. Scientists believe that the mind is just a collective form of all the senses, memory etc. But we all feel there is something that isn't just that. Senses that aren't related to our surroundings and the things we know. If the brain is all that makes the mind, we simply can't put a mind into a robot. Our brain is so complex , made better and better every moment, for thousands of years. Whatever technology we can make is also made by the same brain. So we'll have to wait for maybe another 4 or 5 hundred years to solve this mystery.who knows!

  9. We can find what happened at the time of the big bang, but only for values of time > 0. For any other values of time including t=0, it is impossible to find what there was because the phenomenon hasn't left any trails or clues for us to move on with.

    From a dead body we can find how he looked like, what kinda food he ate etc but we cannot find out what all things went through his mind , even at the time of death. , as it doesn't leave any trails behind.

    We just get the outline and not the complete picture. Same is the case with the universe and all those stuffs.

  10. According to Newtonianism (and maybe other approaches as well), all objects are supposed to fall at the same rate in the same gravity regardless of mass. Yet, as particles get lighter, they become more likely to escape gravity wells with lower amounts of energy/momentum. So a water molecule can evaporate off the moon, whereas Earth's gravity is too strong for that to happen to water, although it could happen to helium on Earth.

     

    Helium floats not because it interacts different with gravity, but because its density is much lighter than that of other gases that comprises the atmosphere. It is just like oil floating on water.

  11. can we store static electricity in any form like with the help of rechargeable batteries, if possible pl let me know how?

     

    It depends on how you are making static electricity. If u're making static electricity by rubbing it, it will stay in that object. But different factors like humidity, etc.

     

    But you can charge a capacitor and keep it too. Plastics ( i don't know which type) can store static electricity for very long time.But we can't discharge it whenever we need. It will be useless.

  12. So... does light move inwards even after crossing the event horizon? I think it shouldn't. If there's any movement inside the black hole, that means, there's an existence of dimension , leading to the existence of time. But inside a black hole, time is non existent.

     

    ???

  13. you should realize that space and time at the "time" prior to the big bang was non existent.

    Even scientists do not know and can not know what was before the big bang, since time is a necessary asset in order to know. Time and space were not there in the first place. So that means an absolute nothing pregnant with potentially something of an outburst, you may conclude.

    Not so.

    When nothing is there, nothing does not even mean nothing. even zero is not there. Nothing is too much because there can not be a description of nothing when there is nothing. ................. o000000.00000.0000000.000000.0000000000000000000.000000000000000000000000000000000.000000000000000000000000000000000000000000000000000000000000000 etc etc etc endless nameless.

     

     

    Maybe nothing means -"without space, energy,matter or time present" my opinion is different. Time and space may not be present, but something that might not be accessible by us today would have been there before the big bang. Maybe a dimension different from what we can understand.

     

    Because we know that the universe is expanding. It is said that at the time of the big bang, space and time was instantaneously created. There's no big bang happening now but still more and more space is occupying the "nothing" as universe expands. So there should be something else that can be measured by some unknown dimension that keeps converting into space and maybe vice versa.

     

     

    I might be wrong, but i believe that's the only way to explain this.

  14. One answer leading to another heavier question. And where will it all end? Just like the universe. We know the universe is expanding. But to "where" or to "what"? Started from a point so small, growing and growing each moment. Maybe we humans are bound to laws and properties so much that it restricts our thinking. Knowing lesser may have been the secret of great thinkers like Da Vinci, Einstein, Newton..... . Who knows....

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