special relativity

Have you ever wondered what would happen if a human body could reach the speed of light? This mind-bending concept has long intrigued scientists, science fiction writers, and the general public alike. In this article, we will explore the theoretical implications of a human body reaching the speed of light, as well as the scientific principles governing this limit. Let’s dive into this exhilarating thought experiment and uncover the fascinating physics behind the speed of light.

The Speed of Light and Relativity

The speed of light in a vacuum is approximately 299,792 kilometers per second (186,282 miles per second) [1]. This universal constant, denoted by ‘c,’ is not only essential in the field of optics but also plays a crucial role in the special theory of relativity. According to Albert Einstein’s groundbreaking theory, the speed of light is the ultimate cosmic speed limit [2]. This means that nothing with mass can reach, let alone surpass, the speed of light.

The Theory of Relativity and Time Dilation

One of the remarkable consequences of Einstein’s theory of relativity is time dilation. As an object with mass approaches the speed of light, time begins to slow down relative to a stationary observer [3]. This means that if a human were to somehow reach near-light speed, they would experience time at a slower rate compared to someone who remained on Earth. In the famous “twin paradox,” one twin traveling close to the speed of light would age more slowly than their Earth-bound sibling [4].

The Mass Increase and Kinetic Energy

Another intriguing aspect of approaching the speed of light is the effect on an object’s mass. As an object’s velocity increases, its mass also increases according to the relativistic mass formula [5]. Consequently, a human body moving at near-light speed would acquire an immense mass.

The increase in mass is accompanied by a corresponding rise in kinetic energy. As the human body approaches the speed of light, the required energy to continue accelerating increases exponentially. It would take an infinite amount of energy to propel an object with mass to the speed of light, making it physically impossible [6].

The Physical Consequences

If, hypothetically, a human body could reach the speed of light, several bizarre and lethal consequences would occur. Firstly, the human body would be subjected to immense forces due to its increased mass, making it impossible to maintain structural integrity [7]. Furthermore, the body would collide with space particles, like hydrogen atoms, at an extreme velocity, resulting in intense radiation that could destroy the body at the molecular level [8].

The Role of Wormholes and Warp Drives

While it is impossible for an object with mass to reach the speed of light, scientists have explored other means of achieving faster-than-light travel, such as wormholes and warp drives. Wormholes are theoretical tunnels in spacetime that could allow instant travel between two points in the universe [9]. On the other hand, the concept of a warp drive involves bending spacetime around a spaceship to propel it faster than the speed of light without violating the laws of physics [10]. Although these ideas remain purely theoretical, they offer an exciting glimpse into potential methods of rapid interstellar travel.

Conclusion

In conclusion, the laws of physics prevent a human body from reaching the speed of light. The consequences of approaching this cosmic speed limit include time dilation, increased mass, and a corresponding rise in kinetic energy. Despite the impossibility of light-speed travel, scientists continue to explore alternative methods, such as wormholes and warp drives, to facilitate faster-than-light exploration of our universe.

Source List:

[1] National Institute of Standards and Technology. (n.d.). Speed of Light. Retrieved from https://www.nist.gov/pml/atoms/speed-light

[2] Einstein, A. (1905). Zur Elektrodynamik bewegter Körper. Annalen der Physik, 17, 891-921.

[3] Taylor, E. F., & Wheeler, J. A. (1992). Spacetime Physics: Introduction to Special Relativity (2nd ed.). W. H. Freeman.

[4] Langevin, P. (1911). The Evolution of Space and Time. Scientia, 10, 31-54.

[5] Okun, L. B. (1989). The Concept of Mass. Physics Today, 42(6), 31-36.

[6] Serway, R. A., & Jewett, J. W. (2018). Physics for Scientists and Engineers with Modern Physics (10th ed.). Cengage Learning.

[7] Thorne, K. S. (1994). Black Holes and Time Warps: Einstein’s Outrageous Legacy. W. W. Norton & Company.

[8] Sagan, C. (1994). Pale Blue Dot: A Vision of the Human Future in Space. Random House.

[9] Morris, M. S., & Thorne, K. S. (1988). Wormholes in spacetime and their use for interstellar travel: A tool for teaching general relativity. American Journal of Physics, 56(5), 395-412.

[10] Alcubierre, M. (1994). The warp drive: hyper-fast travel within general relativity. Classical and Quantum Gravity, 11(5), L73-L77.

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According to traditional physics, once you go far enough into a black hole, traditional physics simply ceases to be. Any meaningful equation breaks down into nonsense. Insanity. Cosmic nincompoopery! Well, not anymore…

Einstein’s theory of general relativity states that if a person were to fall into a black hole they’d be shredded to the atomic level by a process called spaghettification, described as being stretched into an infinitely long strand of matter and energy by infinitely strong gravity. This infinitely strong gravity is due to a singularity at the ‘end’ of the black hole, an infinitely dense area with zero volume. A singularity is also used to describe the Big Bang.

There is a problem though; conventional physics cannot describe what occurs at a singularity point, so talking about the beginning of time or the core of a black hole has always been one-pointed, but pointless. Then quantum mechanics appeared.

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By using the theory of loop quantum gravity, a merger of quantum mechanics and general relativity which describes space-time as a web of indivisible chunks about 10^-35 meters in size, physicists have come up with a practical way to describe what occurs at the singularity point; the singularity isn’t there.

There is no singularity. Gravity still increases as you get pulled into the black hole, but eventually it decreases, and you come out the other end. Although theories have postulated this idea before, the problem was that the singularity could never be bypassed. This is incredibly revolutionary because modern day physics has always taken the idea of a singularity for granted. The universe had forever been filled with them; all of time and space began as a singularity.

You are probably wondering what this means for you and me, what relevance this all has. This opens the doors for even more science fiction to become science reality (consider: just about every piece of technology that exists today was written about as science fiction at one point).

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According to the new theory, black holes are more likely doors to other universes, or incredibly distant areas of our own universe, or both. Even more amazingly, using loop quantum gravity theory, if you were to rewind the big bang you wouldn’t be left with an infinitely dense point of mass and energy, you would cross a quantum bridge into another, older universe.

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This also helps explain what happens to information that approaches a black hole. In a black hole with a singularity, the information would be lost forever as the black hole eventually evaporates after hundreds of trillions of years (give or take several hundred trillion years). As Jorge Pullin, lead researcher on the study at Louisiana State University, points out: