Few minutes ago I read some nice lines which I like to share with others :
We can see things faster than the speed of light. For example, if we sweep a laser beam across the moon, the velocity of the spot can easily exceed the speed of light.
The physics result is that anything which can be brought to rest, like an electron or like you, cannot even reach the speed of light. In theory there can be particles that travel faster than light; we even give them names: "tachyons". A few years ago some physicists at a laboratory near Geneva Switzerland reported that they had actually observed such particles, but a year later they retracted their result; they had found an error in their instruments. By the laws of physics, tachyons could never be brought to rest; however, that does not mean they don't exist.
Light also cannot be brought to rest. If you try to stop light, its energy disappears, and it no longer exists. This happens every time light is absorbed on a surface.
: Richard Muller, Prof Physics, UCBerkeley, author of "Now-Physics of Time" (2016)
139.2k Views • Richard is a Most Viewed Writer in Speed of Light.
