Chemistry/Physics PS test Time Travel based on Einstein’s theories

Albert Einstein’s Theory of Relativity is composed of 2 separate theories. It includes both the theories of SPECIAL RELATIVITY and of GENERAL RELATIVITY.

the laws of physics are the same for all observers, assuming uniform motion relative to one another, and that the speed of light in a vacuum is the same for all observers regardless of their relative motion or the motion of the light source.

the geometric theory of gravitation. It shows that massive objects cause a distortion in space-time, which is felt as gravity; Einstein extended special relativity to take into account non-inertial frames of reference — areas that are accelerating with respect to each other. Instead of gravitational pull, Einstein suggested that the Earth has curved the space around it, and gravity is pushing down on the Earth’s surface. The Earth is going around the sun because the sun has warped the space around the Earth, pushing it forward and around.
Einstein’s Theory of General Relativity predicted that space-time around earth would be not only warped, but it would also be twisted by the planet’s rotation.

Standing still, the speed of light over a specific period of time is constant. So in relation to Einstein’s Special Relativity theory, a surprising thing happens when you move through space-time, especially if your speed is close to that of light. The faster you travel, such as if you increase in speed in a spaceship, the “slower” time will move as you approach the speed in which light moves. Time would not seem to be moving any differently to anyone on the spaceship itself– you wouldn’t notice this effect until you returned to those stationary people, and in the single day you spent traveling at the speed of light, they had aged as much as 50 years back on the earth.

Unaltered photons in a vacuum will travel at a constant speed along the same unaffected path.
→ Light doesn’t always travel at the speed of light. A new experiment reveals that focusing or manipulating the structure of light pulses reduces their speed, even in vacuum conditions.
→ The researchers produced pairs of photons and sent them on different paths toward a detector. One photon zipped straight through a fiber. The other photon went through a pair of devices that manipulated the structure of the light and then switched it back. Had structure not mattered, the two photons would have arrived at the same time. But that didn’t happen. Measurements revealed that the structured light consistently arrived several micrometers late per meter of distance traveled.

Time travel, in a way, can be accomplished. If someone is looking to get into a machine and go back in time 50 years to do something, it is not going to happen. However, time travel can be accomplished in that by traveling outside of Earth, at very fast speeds, such as in a spaceship, and then coming back to Earth, would cause time to have passed slower for you in space and for a significant amount of time to pass on the planet while you were gone. You can never travel backwards through time, but you can relatively alter the speed at which time passes for yourself, by traveling at different speeds.

b. 2

a. relative motion

d. gravity

c. push; pull

c. constant

a. rotation

b. it would move more slowly

d. structure

c. The laws of physics allow for time travel, but it is unlikely it will ever occur.

c. going back in time and causing the death of your great-grandfather