The concept of time has already been discussed in earlier blogs. Light is the visible element that enables us to see things when light reflects on it. The speed of light is 299792458 meters per second or 1080,000,000 KPH. The speed of light according to WikiPedia is "a universal physical constant". However, X ray and laser seems to be travelling faster than light. Thus it is merely a reference value. Lets just take the reference value as the standard.
Now to see the light one second before now, you have to travel faster than the speed of light. It takes twice the speed to reach the light one second ago if you are travelling in the same direction as light. However, you can't travel in the opposite direction as light has not reflected from the object yet otherwise you would have gone past the object and chasing the light that does not exist. At best, you would have chased the past light in the other direction if the light is always on.
Travelling to see one second of the light before now needs you to travel at double the speed for one second. How long to take before you can catch up with the light one hour before at the same speed?
Now, even when you can see the light one second before, there is nothing you can do to alter it since it is already in the past. Therefore, the theory of changing the events that occur in the past is meaningless since you are only chasing the light not the object.
Even if you are chasing the object that travels away from you, you are merely reaching the object in its present state. There is no way you could have change anything before that state even if you travel ahead of it. You will only be able to see the "now" state of the object. Obviously you could change the environment before the object reach you but its not the future of the object, you are merely changing the "now" state of the environment so that the "now" state of the object and the "now" state of the environment where you are now coincides.
An analogy can be shown by a person shooting an arrow towards a target and another person moved the target before the arrow reaches it. It is just the "now" moment with the two object.
Frankly speaking. The "now" state occurs on everything simultaneously. Nothing you do that could possibly change the "now" state as time is a measurement of a past event that is not changeable.
On the speed of light thing, a person can only withstand a certain G-force before he black out or dies. 1 G is 9.81 meters per sec. Light speed is 299792458 meters per sec. Without calculation, you will know that it is impossible to survive if you travel at the speed of light.
On the joking side. If there is no light then you can see nothing. How would you be able to chase the light at light speed? How is it possible to see anything?
One other thing, if you are travelling at the speed of light, those light you will see is probably a small area of light that is travelling in the parallel direction. How big a lens would be able to use to view an area of a square meter that is 299792458 meters away?
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