I can be as heavy as I am light, hold secrets of the universe, and reflect your thoughts. What am I?

Category: Knowledge · Difficulty: hard

Hint: Consider objects that are both dense and elusive.

Answer

A black hole

Explanation

A black hole is dense, has immense gravity, and holds secrets of the universe, while being invisible to the naked eye.

This is a hard knowledge riddle — a tricky one that takes a little thought. The answer is A black hole.

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