- 3757 - SPACETIME - universal limits not to be exceeded? Why can't we travel faster than the speed of light?" Because the mass of objects becoming infinitely large. That answer is fine, but there's a better one. Space and time are unified into a single entity known as “spacetime“.
------------- 3757 - SPACETIME - universal limits not to be exceeded?
- Every object travels through spacetime at the speed of light. Even a stationary object is moving at the speed of light, but it is moving only through time and not space. I am moving through time at the speed of spacetime? Did not know I could type that fast.
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- Albert Einstein is frequently regarded as one of the most influential scientists of all times, with his brilliant insights about the laws of nature. However, his work has one very disappointing consequence. His theory demonstrated that there is one fastest speed in the Universe: the speed of light. That means the shortest possible round-trip to the nearest star will take nearly a decade.
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----------------- The speed of light = 983,568,960 feet per second
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- Do you want to understand why you can’t go faster than light? This ultimate speed limit is a curious fact and one that runs against our common intuition. However, speeding up eventually stops working. No matter how hard you try, you cannot go faster than 186,000 miles per second (300,000 kilometers / second).
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- The most common explanation for this cosmic speed limit is that as an object goes faster and faster, its mass increases. And this explanation makes some sense. After all, it’s harder to push a mountain than a pebble. If the mass of objects become infinite as they get closer to the speed of light, it makes sense that you cannot break that speed barrier, it would take infinite energy to accomplish.
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- But it’s not the best answer. Everything travels at the speed of light. To understand the real reason why you cannot go faster than light requires that we learn a key idea from Einstein’s theory. While our common experience tells us that space and time are different things, he realized that they are more similar than different. Instead of space and time, there is a single thing, called “spacetime“.
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- Look at any world map. We can identify a location on the map as two numbers: latitude (the north/south number) and longitude (the east/west number). While there are some minor differences, for example, it gets hotter or colder as you move north/south, there really is no difference between the two directions.
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- In spacetime, it’s much the same. Individuals can move through time or space, just as travelers can decide to move east/west versus north/south.
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- Now for the key insight. One of Einstein’s professors, a mathematician by the name of Hermann Minkowski, looked at Einstein’s theory of relativity and realized that at its deepest and most fundamental level, the theory said that any object was simply traveling through spacetime, partially through space and partially through time. When Einstein’s theory was pushed harder, what was revealed was that every object travels through spacetime at a single speed, the speed of light.
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- To understand this more easily, suppose you are at some location that is big and flat, like the Bonneville Salt Flats in Utah. Suppose further that you are in a car which has the accelerator locked so that it only can go at a single speed, 60 mph (100 km/hr).
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- Now, let’s get behind the wheel and drive. If you go east at 60 mph, you don’t move at all in the north/south direction. Similarly, you could drive north at fixed speed, but then you wouldn’t move at all east/west. Or, you could choose to drive to the northeast at 60 mph, thereby moving in both the easterly and northerly directions at a speed of about 42 mph (69 km/hr).
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- If you move at fixed speed, the bottom line is that you can move in any direction you want, but in no direction can you move faster than that fixed speed. And this is identical in spacetime. Objects move in spacetime at the speed of light.
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- A stationary object isn’t moving through space at all, so the object is moving through time at the speed of light. Furthermore, an object moving through space at the speed of light has no speed left over to move through time.
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- Thus, the absolute maximum speed an object could move through space or time individually is also the speed of light. Note that this idea also explains the weird features of relativity, like time slowing down for an object as its speed gets faster and faster. An object traveling more through space is traveling less through time.
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- The speed limit is a harsh reality. The reason that it is hard to travel through space at the speed of light is that you must push the object out of moving in the time direction to moving more in the space direction. And that turns out to be difficult. But, even if you are successful, you can’t beat that single top speed.
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- The real reason you cannot travel through space faster than light is because you are always traveling through spacetime at the speed of light. The best you can do is transport all your effort into moving through space; but, once you have pushed all your motion in the space direction, there just isn’t any more speed left. Just like the car that can’t go faster than 60 mph, you’ve topped out.
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- Does this mean that the day when we finally venture out into interstellar space that we are doomed to travel no faster than light? A round-trip to the center of the galaxy and back takes 50,000 years traveling at light speed. Can we do better? Sadly, the answer is no, at least, not without a new scientific discovery.
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- Warp drive, hyperspace, and all the faster-than-light options from familiar science fiction are not real, or, at least, are unknown to our best understanding of the laws of nature. Scientists have discovered unknown things before, like radio waves and radioactivity, so it’s conceivable that a discovery would change everything.
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- On the bright side, now that you know about spacetime, the next time your boss gets on your case for just sitting there, you can tell them that they are being unreasonable. You’re moving as fast as possible.
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November 26, 2022 SPACETIME - universal limits not to be exceeded? 3757
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