have we yet reached speed of light
Measurements are always finite so they prove nothing about finiteness,which should have been established before any attempt to measure.It wasn't.This means that the measurement simply can't be taken seriously. By contrast,assuming that any visible object is seen as it is is a much stronger assumption than assuming that light has a finite speed.This also means that there has been a lot of misguided scribbling.
299,792,458 m/s. We haven't reached the speed of light yet because as an object approaches the speed of light, its mass becomes infinite. Einstein was the first to come up with this.
its usually approximated in usual situations to be 3.00E8m/s or 300 000 km/s. its not quite, but it is close. and no we have not reached the speed of light yet, and we never will. as predicted by the special theory of relativity, as you increase in speed, the mass of an object also increases (an immeasurably small amount in everyday scenarios, but when approaching the speed of light it increases ever faster and faster. as the mass of an object increases, the energy required to accelerate that object any further also increases. eventually, at the speed of light, the mass of an object increases to become infinite, meaning the energy required to get it to that speed is also infinite. since that amount of energy clearly isn't up for grabs, especially not by us humans, we will never be able to reach or exceed the speed of light. this is the reason why only electromagnetic waves, and other waves with no intrinsic mass of their own can ever travel at that speed.
Pyro4life said, the answer is roughly 299,792,458 meters per second No, the answer is _exactly_ 299,792,458 m/s. Like Pyro said, the speed of light is a fundamental constant of nature. We ordinarily define speed in terms of distance and time, but in this case, we define distance (i.e., the meter) in terms of the universally-constant speed of light, and time. We do it that way because we know how to measure time with far greater precision than we are able to measure distance. The official, internationally agreed upon definition of the meter, as of 1983 is the distance that light travels in 1/299,792,458th of a second.
the speed of light is sqrt[1/(μoxεo)] where μo is the permeability of free space which = 4pix10^-7 and εo is the permittivity of free space whice is 8.8542 x10^-12 the answer is roughly 299,792,458 meters per second this shows that the speed of light is actually a property of space, and being derived from constants is therefore constant. it is a physical impossibility to reach the speed of light if you have mass. thats why the only things that go the speed of light (as yet discovered) are photons, which are massless
