No. At least, all available evidence seems to indicate that it is not possible to transfer matter, energy, or information faster than the speed of light.
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The speed of light is not limited in a vacuum - the speed of light is fastest in a vacuum. But that is what Einstein called the "Cosmic Speed Limit" - nothing can move faster than the speed of light in a vacuum, or even quite asfast.
no
About 2/3 its speed in a vacuum.
The speed of light is 186,000 miles per second in a vacuum.
A "fact" is basically anything you can state, especially if such a statement is true. Since you can say "light has a speed", and since that is true, it follows that it's a fact. Light through a "vacuum" is the meaning of "the speed of light." Light through glass is slower.