Dark Matter – An invisible substance holding galaxies together, but we don’t know what it is.2. Dark Energy – A strange force making the universe expand faster and faster.3. Black Holes – Regions where gravity is so strong that not even light can escape.4. Fast Radio Bursts (FRBs) – Mysterious, super-powerful signals coming from deep space.5. The Fermi Paradox – With so many planets, why haven’t we found alien life yet?
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