When these stars move out of your perceptible wavelength, they simply appear to fade to black or vanish against the background. The Universe has picked relativity and causality, it seems. Thus, we cannot travel or communicate faster than light.
- When the astronauts returned to Earth, with their journey having been shorter than yours by several seconds, that was because you wound up at the same location.
- I read somewhere that if we are ever able to travel faster than the speed of light that fact would automatically enable us to travel back in time.
- Swapping past and future light cones (advanced and retarded potentials, entropy increasing or decreasing, etc.) is one thing, but swapping timelike with spacelike intervals is quite another.
Relativity mixes up space and https://top10ten.co.uk/eastern-england/great-yarmouth-and-the-norfolk-broads/751-1-wildlife-boat-trips-on-the-norfolk-broads.html time, so their space axis I perceive as slanted – just like their time axis is skewed. It turns out that the space axis is flipped across the 45 degree null line, but I’m not going to prove that. This weird mixture of space and time of observers I perceive as moving is a necessary part of relativity. It is the only way everyone can agree that light moves at c. When light passes through a medium such as air, it is slowed. The effect is best explained by analogy with water waves.
Ways To Travel Faster Than The Speed Of Light
“But this is something we can never actually know. The signals carrying their voices and images travel incomprehensibly fast, but it still takes a finite time for those signals to reach us.” However, the astrophysicist didn’t exactly rule out time travel on his death in March 2018. In his posthumous book “Brief Answers to the Big Questions”, he came back to the topic again. That depends on details of the journey, but a backwards-moving spaceship would be a possible observation. In other words, a galaxy 1 megaparsec away appears to be traveling away from the Milky Way at a speed of 42 miles per second (68 km/s), while a galaxy two megaparsecs away recedes at nearly 86 miles per second (136 km/s), and so on.
How Did We Learn The Speed Of Light?
On the right, Δt is the time interval between two events as measured by the person they affect. (In our example above, this would be the person in the train.) On the left, Δt’ is the time interval between the same two events but measured by an outside observer in a separate frame of reference . These two times are related by the Lorentz factor (γ), which in this example is a term that takes into account the velocity of the train relative to the station platform, which is “at rest”. In this expression, c is a constant equal to the speed of light in a vacuum. Where would it go if anything could travel faster than the speed of light? It wouldn’t be the spacecraft moving over the cosmic speed limit.
They have identified quasars which are physically connected to galaxies as if being produced by the galaxies. What’s interesting is that the red shifts are very different. This provides solid evidence for the work of Halton Arp . In his book “Seeing Red’ he made a convincing case that red shift is an intrinsic function of age, not distance or velocity. This would invalidate the data used to propose both the big bang and expansion. Maybe this is why neither concept makes much sense and cannot be verified.
If the initial state did not have low entropy you can’t explain why our universe evolved in the way that we observe. The following was triggered by “Our observation that forward in time is different than backward in time comes from entropy increase.” Time travel in relativity necessarily also involves spatial displacement. It is also straightforward to draw a specetime diagram in which you do this twice and end up in the past light-cone of the point you started at. Some people prefer the written word, some prefer the spoken one. I am trying to find a time-efficient way to present content to both audiences, and this solution kind of works.
This is all very peculiar, but it doesn’t actually take you back in time. As the ship’s velocity increases, what the observer sees looks the same, but the reality is very different. The observer watches the spaceship leave the launch pad and head out to the planet, just as before; however, a real pair of spaceships appears on the landing pad, not simply one and an image! Then, one of the ships immediately takes off for the planet, again in reverse, and annihilates with the original ship in a real pair annihilation event at the planet. The complications arise because our observations depend upon our velocity.
General Relativity
An Earth clock would say it took about a year and a half. “There are some important things you should probably know about approaching the speed of light,” NASA’s video, Guide to Near-light-speed Travel, explains. “First, a lot of weird things can happen, like time and space getting all bent out of shape.” In addition, you would notice an extreme Doppler effect, which would cause light waves from stars in front of you to crowd together, making the objects appear blue. Light waves from stars behind you would spread apart and appear red. The faster you go, the more extreme this phenomenon becomes until all visible light from stars in front of the spacecraft and stars to the rear become completely shifted out of the known visible spectrum .
