Alot of stories can be concocted by what seems like just like in science fiction. Am more about what is, not what seems like. But if effect before cause seems illogical to you, that means your perspective on things are about what things seems, and not what they are.The paradox of the tachyon sounds simple and seems possible, but if you think about it realistically, you know it can’t happen. The universe keeps right on expanding, but the speed of light limits how much of it we can see, and how fast we can move. So, while the speed of light remains an unbreakable barrier for those of us within the universe, it can’t limit the expansion of space-time itself. Just because the expansion of space can break the speed limit, it doesn’t mean that we can go faster than Einstein said we could. The speed of light limits how fast the beetle can travel, but not how quickly the bread can rise. When the beetle burrows through the bread, he is moving relative to the dough, and all the other raisins. The beetle represents anything within space, such as baseballs, spaceships or photons. Now let’s imagine that there’s a beetle in the loaf and it starts crawling toward a faraway raisin (don’t worry- we’re not going to eat it anyway). As the dough expands, the raisin galaxies find themselves farther apart from each other, even though they are not moving relative to the dough between them. The raisins are galaxies and the rising dough represents space-time. To better visualize the theory, astronomers often illustrate the expanding universe as a loaf of raisin bread rising in the oven. The speed of light is only a constraint for objects that exist within space-time, not for space-time itself. When we say an object has motion, we’re referring to its change in position relative to the space-time grid. Basically, space-time is the three physical dimensions of our existence-length, breadth and depth-combined with the additional dimension of time think of it as a wire grid that connects every part of the universe to every other part. When astronomers say that the universe is expanding, they’re talking about the rather abstract concept of space-time. This ultra-fast growth seems to contradict what we’ve just discussed, but it makes sense if you understand the distinction between expansion and motion. Since then, the universe has continued its expansion, but at a more reasonable, steady pace. At the end of inflation, although the universe was still smaller than a car, the outer edge had traveled many times faster than the speed of light. The whole thing was over in less than a trillionth of a trillionth of a second, but the universe grew exponentially in that brief blip, repeatedly doubling in size. Right after the Big Bang, the universe had a monstrous growth-spurt called inflation. The movement of space itself, however, can make the speed of light seem slow. But is there anything that can? It turns out that the speed of light is only a limit on objects – like baseballs – as they move through space. Now that we have a taste for Einstein’s theory, we know that baseballs don’t go faster than the speed of light.
That’s because the image of object would be traveling at the speed of light, trailing the faster baseball like the slower sound of thunder trails after the image of lightning. If you were a catcher trying to catch a superluminal fastball, you might feel the ball hit your glove even before the pitcher starts his wind-up: The effect before the cause. If things could move faster than the light we see them by, we’d be in for weird experiences. The speed of light affects us more than we realize – it helps us understand the difference between cause and effect. Light is different, because no matter what you’re doing it always goes the same speed. For example, if you try to measure the speed of an oncoming car from a moving vehicle, you end up getting the combined speed of both cars. This line of thinking is a lot different than we’re used to experiencing. It’s always the same whether you are in motion or at rest. This is true, but slightly misleading.Įinstein’s theory of special relativity, first published in 1905, asserted that the speed of light is a constant (300 million meters per second), no matter who measures it.
But back in reality, we’ve all been taught that the speed of light is a strict traffic law that can’t be broken. In science fiction universes, traveling the galaxy is a snap – just engage the “warp” or “hyperspeed” drive, and off you go, cruising the cosmos at several times the speed of light.
Crashing Galaxies Offer Best Evidence Yet of Dark Matter Allison Bond
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