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LIGHT-SPEED/LIGHT-TIME light moves at 300 000 kilometres a second
the speed of light is a constant and when used with planck's constant and newton's gravity light-speed can be used with confidence to explain and understand much of our experience of reality example 1 the planet mars is sixty four million kilometres from the earth sixty four million kilometres divded by three hundred thousand kilometres equals two hundred and thirteen seconds at the speed of light two hundred and thirteen seconds is three and a half minutes travelling at the speed of light it would take three and a half minutes to go from the earth to mars example 2 the gathering place is 50 light years away travelling at one third of the speed of it would take 150 years to get there

this entry was formed in an attempt to simplify the unnecessarily complicated terminology in use in the sciences

see also poincares' theory of relativity