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11. Twin Paradox:

According to Einstein's theory of relativity, time dilation occurs, leading to the "twin paradox." If one twin travels at nearly the speed of light and returns, they would be younger than their sibling.

12. The Moon is Moving Away:

The Moon is gradually moving away from Earth at a rate of about 3.8 centimeters (1.5 inches) per year.

13. White Holes Hypothesis:

While black holes are well-known, the concept of white holes suggests a region of spacetime that expels matter instead of capturing it.

14. The Cosmic Microwave Background (CMB):

The CMB is not perfectly uniform; there are slight temperature fluctuations, providing essential clues about the early universe's structure.

15. Quantum Entanglement:

Quantum entanglement, where particles become connected in such a way that the state of one instantly influences the other, challenges our classical understanding of physics.

16. The Largest Known Star:

UY Scuti holds the title of the largest known star, with a diameter that could engulf the orbit of Jupiter if placed in our solar system.

17. Time Travel Possibilities:

Some theoretical physics models allow for the possibility of time travel through concepts like wormholes, though practical implementation remains highly speculative.

18. The Observable Universe's Age:

The age of the observable universe is approximately 13.8 billion years, calculated using observations of the cosmic microwave background.

19. Quantum Foam:

At incredibly small scales, spacetime might be "foamy," according to certain quantum gravity theories, where fluctuations occur at the Planck scale.

20. Dark Matter Filaments:

Dark matter is thought to form a vast cosmic web of filaments connecting galaxies across the universe.

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