I measure the universe's expansion, yet I am not a measuring tape. What concept am I?
Category: Science · Difficulty: hard
Hint: I relate the velocity of galaxies to their distance from us.
Answer
Hubble's Law
Explanation
Hubble's Law states that galaxies are moving away from us, with their speed proportional to their distance, indicating the universe's expansion.
This is a hard science riddle — a tricky one that takes a little thought. The answer is Hubble's Law.
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