How fast is the speed of dark?

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4. What is a Yottaflop?
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Tags

1. #possible
2. #speed
3. #already
4. #travels
5. #object
6. #short
7. #darkness
8. #moment
9. #leaves
10. #physical
11. #fastest
12. #respect
13. #returns
14. #absence
15. #means
16. #light