What celestial phenomenon ticks away the ages, marking the time since the universe began?
Category: Science · Difficulty: hard
Hint: It's a remnant of the Big Bang.
Answer
Cosmic microwave background radiation
Explanation
Cosmic microwave background radiation is the afterglow of the Big Bang, providing evidence of the universe's age and expansion.
This is a hard science riddle — a tricky one that takes a little thought. The answer is Cosmic microwave background radiation.
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