I measure the age of the universe, yet I cannot be seen. What am I?
Category: Science · Difficulty: hard
Hint: I am the remnant radiation from the Big Bang.
Answer
Cosmic microwave background
Explanation
The cosmic microwave background radiation provides evidence of the universe's age and origins, making it the correct answer.
This is a hard science riddle — a tricky one that takes a little thought. The answer is Cosmic microwave background.
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