What concept measures the ages of stars and planets, ticking away since the dawn of time, yet is invisible?
Category: Science · Difficulty: hard
Hint: Think about how we measure the universe's history.
Answer
Cosmic time
Explanation
Cosmic time refers to the age of the universe itself, calculated through various astronomical observations.
This is a hard science riddle — a tricky one that takes a little thought. The answer is Cosmic time.
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