Dark Matter: Scientists estimate that dark matter makes up about 85% of the matter in the universe, but its nature and composition remain a mystery.
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Dark Energy: Dark energy is a hypothetical form of energy that is believed to be responsible for the accelerating expansion of the universe, but its source and properties are unknown.
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Cosmic Inflation: According to the Big Bang theory, the universe underwent a brief period of rapid expansion known as cosmic inflation. However, the cause of inflation and its exact duration are still unknown.
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Black Holes: Black holes are incredibly dense objects that exert a powerful gravitational pull. While we have observed their effects on surrounding matter, much about their internal workings remains a mystery.
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The Fermi Paradox: The Fermi Paradox refers to the contradiction between the high probability of the existence of extraterrestrial civilizations and the lack of evidence for their existence.
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The Pioneer Anomaly: The Pioneer 10 and 11 spacecraft exhibited a slight, unexplained deviation from their expected trajectory as they traveled through the outer solar system.
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The Wow! Signal: In 1977, a radio signal was detected that appeared to come from outside our solar system. Known as the Wow! signal, its origin remains a mystery.
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The Nature of Time: Time is a fundamental aspect of the universe, but its true nature and whether it is continuous or discrete is still debated among physicists.
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The Ultimate Fate of the Universe: While we know that the universe is expanding, its ultimate fate is still unknown. Depending on the amount of matter in the universe, it could continue to expand indefinitely or eventually collapse in on itself.
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