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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