Well, I would think we can tell it won't ever be invented because no one has come "back" to modern world or back in history... I would think if I time-traveled, I would want to tell everyone who I was...
Einstein's laws of physics suggest that time travel is only possible into the past as far as the point when the first time machine was invented. Ergo Time travel has not yet been invented.
it hasnt even been confirmed so not for a long time
No. No one has invented time travel.
A fiction invented by writers
it hasnt
A time machine has not been invented due to several reasons. First, we do not fully understand the processes that would allow such a machine to function. Secondly and according to Einstein in order to travel through time an object must reach the speed of light, which is likely impossible.
it depends if you are incresing or decreasing your speed over that interval of time. just remember that you can never have a negative number for time. it hasnt been proven.
I dont know, there hasnt been anywhere, where it showed the answer.
It hasnt. uKink?
Time travel has never been invented as such.When you run, you're technically time travelling. If you put a clock at the station and on a train perfectly the same, the clocks will be different when the train reaches it's destination. This difference isn't really measurable but we know that it's there.
No, time travel is, thankfully, only science fiction.
no cause at the time that wasn't even invented and it still isn't.