What is the approximate speed of light in a vacuum in kilometers per second?
Answer
299,792 kilometers per second
Light maintains a constant speed when traveling through the near-empty vacuum of space. This speed is approximately 299,792 kilometers per second. This speed is the fastest rate at which anything can travel in the universe, and it is the fundamental constant used to establish the definition of a light-year.
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How Many Years are in a Light Year? | The Speed of Light - YouTube
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