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What is a light year?
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Distances in space are so huge that astronomers measure not in miles but in 'light-years': the distance light travels in a year. Light travels at nearly 190,000 mph (300,000 kph), so a light year is about 5.9 million million miles (9.5 million million km). | | Stars and shining clouds of gas and dust fill the night sky. Those shown here are within the constellation of Orion. |
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Previous:
Back
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Book:
1001
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Section:
Space
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Chapter:
The Universe
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