Time required to do what? To move from one place to another, divide the distance by the speed of light.
Electrons are able to travel close to speed of light.
Nobody knows for sure. We have never witnessed a physical object traveling faster than the speed of light.
It is travelling at a constant speed. This does not mean that there is no acceleration or that the direction of motion remains the same.
It is travelling at a constant speed. This does not mean that there is no acceleration or that the direction of motion remains the same.
No, speed does not include the direction an object is traveling. Speed only refers to how fast an object is moving regardless of its direction. Velocity, on the other hand, includes both speed and direction.
The speed of light is constant. It is 671,000,000 mph.
An object that normally doesn't move at light speed (so, this doesn't include photons for example) CANNOT move at the speed of light. As it approaches the speed of light, its mass will get higher and higher (and tend towards infinity); as will the energy required to continue speeding it up.
It is not possible for any physical object to accelerated to the speed of light. But in one particular extreme it is possible to slow the speed of light according to the Bose-Einstein Condensate. The question better stated would be "Would an independent observer see light emanating from a source that is traveling backwards at the speed of light?" Yes. Light always travels at the same rate. No matter how fast you are traveling, any light that you emit will always travel at a constant rate. (note that it's not possible for a physical object to actually travel at the speed of light in a vacuum).
According to the theory of relativity, time does not stop at the speed of light, but rather it slows down. This means that for an object traveling at the speed of light, time would appear to pass more slowly compared to an observer at rest.
subsonic
No. Speed of light is constant in all frames of reference, even if you are also traveling at the speed of light, the photon will speed away from you at the speed of light. When you see an object, what is happening is that photons are reflected off the object you are looking at and bounce back into your eye. However, if you are traveling faster than the speed of light, the photons can never reach you to start with, hence, you are invisible until your speed decreases to something below the speed of light. It is possible to travel faster than light in many ways. First, if you have a negative amount of energy, you will always travel faster than a speed of light. Another possible way is to compress the space in front of you, then move to your destination before re-expanding the space you have just past.
there's four speed. There are constant speed, average speed, increasing speed, and decreasing speed. choose one of them