## einstein's equation

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### einstein's equation

i can prove einstiens equation e=mc^2 wrong, it stands for energy equals mass by the velocity of light squared, but light isn't neciccarily about 186000 miles per second(its either miles or kilometers), it only is in a vacuum. i read somewhere that if you shone light through ultracold carbon (a few kelvins above absolute zero), the light would only travel 17 meters per second, and lots of things can go faster than 17 meters per second.

 forgot the end parenthasis: (its either miles or kilometers)
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papernuke
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No, that's silly. c is a constant which stands for the speed of light in a vacuum.

Keiji

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In relativity, c always represents the speed of light in a vacuum. In practice, one often omits the phrase "in a vacuum" because it is assumed that the reader knows this from context.
jinydu
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I go faster than 17m/s (61.2 kph) every day on my way to work. I guess that means that technically I could never be late for work as I would always arrive in the past, thus before my shift started. Since I have been late to work before on a day that I travelled at those high speeds, it would suggest that your theory is wrong.
houserichichi
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