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The speed of light is always the same, as long as the light stays in vacuum

or in the material substance it's in.

The speed of the source generating the light, or the speed of the person

who's measuring the light, has no effect on the light's speed. It will always

measure the same number.

That means:

-- If a rocket is in space, flying toward you at half the speed of light, and the astronaut aboard shines a flashlight at you, and

-- If you strap a jet-pack on your back and fly toward the rocket at half the speed of light, and

-- If you measure the speed of the light from his flashlight as it shines past you,

-- You'll measure the same speed of light as if you and the astronaut were both standing still.

It can't be . . . But it is. It's been confirmed in thousands of experiments during

the past 100 years.

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