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Un article trouvé pour ce sujet.
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How far from Earth is Neptune? |
2006-03-21 |
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Scott pose la question :
A laser beam travelling at the speed of light bounces off the planet Neptune and returns to Earth in 29 960.72 s. The speed of light is 299 792.5 km/s. How far from Earth is Neptune?
Penny lui répond. |
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