Question: How fast is speed of light?

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  1. Good question. The speed of light is just under 300,000 kilometers per second. For reference, the earth is only 12,000 kilometers in diameter!

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  2. The speed of light refers to the distance light can travel in a vacuum. It is exactly exactly 299,792,458 metres per second. REALLY fast!

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  3. To give you some ideas about how fast that is, it takes light from the Sun about 8 minutes to reach us. The light from the nearest other star takes over 4 years to get here. And some of the stars we can see might have exploded 1000 years ago and we would not even know.

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Comments

  1. (in one second, you could travel around the world 7 and half times!)

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