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what does mean Speed of light

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BJsRealm said:
Speed of light is the velocity unit used in astronomy. It is the equivalent to a velocity of a ray of light through the vacuum in angkasa which is virtually unreachable. Speed of light is therefore the ultimate velocity in the universe, at least the modern science is concerned. In the international metric system speed of light equals approximately 300 000 km/h, atau kph.
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