I travel faster than a cheetah but cannot be seen; I can be measured but not caught. My speed defines your world. What am I?
Category: Science · Difficulty: expert
Hint: Think about the fastest thing in the universe.
Answer
Light
Explanation
Light travels at about 299,792 kilometers per second, making it the fastest entity known to science.
This is a expert science riddle — one of the harder riddles here. The answer is Light.
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