Main Question or Discussion Point
there is the speed of light. just wondering, is there a speed of darkness. if so, what is it.
That's a funny one. Reminds me of something I used to tell the kids to get them to close the door at night: "Don't let the dark in."time traveller d said:, is there a speed of darkness.
I would like to take issue with this comment. Being a certified cave diver I have experienced complete and total darkness many times. When your light goes out a few thousand feet from the cave entrance is gets pitch black. There is certainly no visible light being emitted by the cave walls or the water.deepak9191 said:darkness doesnt existbcoz light is present everywhere . remember that light is a wave and has no definite size and shape so it can be present everywhere . even the black hole is not devoid of it. its just a matter that in a black hole we are una ble to see light
Even if I wait for the light to travel to the "wall", I still don't see why the shadow which is moving across the wall can't travel faster than the speed of light.-Job- said:Not exactly. Initially, the farther away the wall is, the faster the shadow will appear to move, but, eventually, the speed of "darkness" should stop increasing with the distance. If you had a really big hand and covered a star in a nearby galaxy with your hand, then as you waved your hand around you'd still have to wait for the light to travel to the "wall". So you can't make "darkness" have infinite velocity or be faster than light.
Why is it going to be bell shaped? And why should it slow down suddenly?-Job- said:The relation between the "speed of darkness" and distance from the hand to the wall is somewhat bellshaped. Meaning that, initially, as the distance increases, the faster darkness will seem to move, until this distance reaches a point after which the darkness not only can't move any faster, but will start to move more slowly.
I believe Ki Man has made the best contribution to this thread so far.Ki Man said:absence of light is darkness
it is nothing
we'll solve this problem right after we figure out the speed of silence
Wouldn't it still be positive 300 000km/s? Its moving in the same direction as the light is moving away from it, therefore both signs would be positive? If it was moving at -300 000km/s, wouldnt it be moving backwards? and then nothing would take the spot of the light or the darkness, which would infact be darkness itself! Omg, now i am confused, way to go.Tide said:The speed of darkness has been measured as negative 300,000 km/s. :)