Being the speed of light is the fastest thing we know please answer this?

Question

i wish i was a scientist and could understand but i will rely on you.

if light is traveling and we are seeing it why is it when the light ends is there not a void?example:turn a garage light on in the dark as soon as you turn the light off there is darkness.so does that not mean darkness is moving at the speed of light?i have never seen black or darkness in a color spectrum but i have read and seen on tv about black energy or black matter so is this what im seeing when i see darkness?is it moving at the speed of light do to theres no void

Answer 1

Light is an energy emission.  Darkness is the absence of that energy emission.   Dark is not a color.  You cannot "see" darkness.  

Answer 2

Simply put - darkness is the absence of light.

Answer 3

Well, darkness is simply the absence of light.  So, when you turn off the garage light, the photons being generated by the filament in the bulb in your garage are traveling & absorbed by the objects in your garage, including you yourself.  

So, when you turn off a light, it gets dark *at* the speed of light.  

Answer 4

You have three questions in one and I will try to answer them in random order.

The darkness that you see in your garage when the lights are off is not black energy or black matter. Dark matter (which I think it's what you are referring to with black energy or black matter) is what physicists attribute for the fact that the universe is expanding at an accelerating rate. They think there is matter outside of the universe that is very massive and that is attracting the matter in the universe and that is why it is expanding ever so fast... this external matter is what they call dark matter. It's important to mention that the reason for the accelerated rate of expansion has not been scientifically determined and that's why there is a nebulous term to explain it: "dark matter".

The first two questions indicate to me a lack of understanding of the physical world and light and I will try to shed some light in this. Light is considered to be a dichotomy in physics: a wave and a particle. For the moment you can consider light to be a wave (electromagnetic wave), so that it behaves just like those ripples caused in water when you throw a stone into a pool. Exactly like those ripples expand in the water in all directions, light is a set of three-dimensional ripples that expand in space. The speed at which these ripples travel is what is called the speed of light.

Now, we should consider how we, humans, perceive things. We only see what our eyes process. For example, there are many waves out there in the world that we cannot see and that does not mean that they don't exist (i.e. radio waves, infrared waves, micro waves, etc). We don't see them because our eyes are not chemically designed to process these types of data. However, our eyes can process electromagnetic waves in the region of visible light (i.e. the electromagnetic waves that have a frequency corresponding to the colors red, green, blue, etc.). Thus, we can see electromagnetic waves that carry information of "blue" or "red" or whatever.

Now, let's see what happens when you turn on the light in your garage: the light bulb turns on and starts emitting electromagnetic waves that expand at the speed of light. There are objects in the room that can absorb, reflect, or shift the properties of the electromagnetic ligt that strikes them. After the em waves hit the objects, the light can now be considered to be particles (photons) and it bounces back in all directions. Some of these particles make it into your eyes and then you process them and say "aha! I see my red car in the garage" because the light was processed and it forms the shape of your red car in your brain.

Of course, when you turn the lights off, there's no more photons bouncing around, hitting objects and then hitting your eyes, so you see dark. This does not meant that there is a void, since the objects still exist in space. Also, this does not mean that darkness travels at the speed of light... darkness is just the lack of light and if light travels at the speed of light, then I guess darkness is just what is left behind (and I guess you could say that it travels at the speed of light since the trailing part of the em wave still travels at the speed of light).

Hope this helps.

Answer 5

Darkness is just the absence of light. The light in the room disappears at the speed of light

Answer 6

Huh?

Answer 7

You're confusing different concepts and the same word used as an adjective here, but with different meanings.

"Dark", in your garage example, is just the absence of light.  Dark doesn't move - light leaves, and the absence of light remains.  It's like shutting off the water in your shower.  You don't suddenly get hit with a bunch of non-water.  The water stops flowing, is all.

"Dark matter" is simply matter that we can't detect.  Scientists CAN measure the speed of objects as they move through space, and can estimate their mass.  They also know the laws of motion that all mass must follow, be they something the size of a bagel, or something the size of the Andromeda galaxy.  The stars and galaxies that we can see don't follow the rules correctly - the stuff that we can see doesn't have enough mass to move the way it does.  They move as if there was much more mass involved somehow.  So scientists and physicists decided that there must be more mass out there, and they've given the name "dark matter" to this mass.

Answer 8

Both light and darkness travel at the same speed: If the sun were to suddenly wink out, Earth would continue to be bathed in light until the last photons reached us 8 minutes later. However, from the perspective of the photons, all journeys are instantaneous because light exists outside of time. Light is timeless and when at rest, possesses no mass. Light is like an ocean wave; to exist it must have movement.  

Answer 9

the speed of light is not really fast, i dont know how to explain to you, but i am sure it is not real super fast compare to others matters.

Answer 10

Dark energy and dark matter are called "dark" because we do not know what they are.  It seems that dark matter is mostly sub-atomic particles that do not interact with light, therefore we cannot detect them with light. Just what these particles are is not yet known though there are predictions from the theory of symmetry  or super-symmetry of what they might be like.  

Dark energy has been proposed as the cause of the rapid expansion of space-time and probably has little to do with ordinary light.    

Ordinary dark is just the absence of enough light to see by.  You could say that form of darkness travels at the speed of light through your garage.