I am the remnants of the universe's first seconds, yet you can’t see me directly. What am I?

Category: Science · Difficulty: hard

Hint: I make up most of the universe's mass, but I don’t emit light.

Answer

Dark Matter

Explanation

Dark matter is a form of matter that doesn't emit or interact with electromagnetic radiation.

This is a hard science riddle — a tricky one that takes a little thought. The answer is Dark Matter.

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