Final answer:
There are three unexplained events involving matter and energy: black holes, quantum entanglement, and dark matter and dark energy.
Step-by-step explanation:
There are several events involving matter and energy that cannot be fully explained:
- Black holes: These are extremely dense objects that have a gravitational pull so strong that not even light can escape. The matter in a black hole is crushed to infinite density, and the energy associated with it is also condensed.
- Quantum entanglement: This is a phenomenon where two particles become linked in a way that their properties are correlated. When the properties of one particle are measured, the properties of the other particle instantly change, regardless of the distance between them. The mechanism behind this is still not fully understood.
- Dark matter and dark energy: These are hypothetical forms of matter and energy that cannot be directly observed, but their existence is inferred based on their gravitational effects on visible matter. Scientists are still working to understand the nature and origin of dark matter and dark energy.
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