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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