Big Bang Theory

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What is the Big Bang Theory?

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The Big Bang Theory is the leading explanation for the origin of the universe, stating that it began as a singular point and has been expanding ever since.

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What does redshift indicate about distant galaxies?

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Redshift indicates that distant galaxies are moving away from us, suggesting that the universe is expanding.

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What is the commonly accepted age of the universe according to the Big Bang Theory?

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The universe is approximately 13.8 billion years old.

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What does it mean that the universe is expanding?

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It means that all galaxies are spreading out from each other, and the universe must have started from a single point.

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How does the abundance of hydrogen and helium support the Big Bang Theory?

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Hydrogen and helium are found in the same ratio throughout the universe, which supports the idea of a common origin.

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What is cosmic microwave background radiation?

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Cosmic microwave background radiation is the afterglow of the Big Bang, filling the universe and providing evidence of its hot, dense beginnings.

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What is the significance of the observable universe?

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The observable universe is the part of the universe we can see and study, limited by the speed of light and the age of the universe.

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What is a galaxy?

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A galaxy is a massive system of stars, stellar remnants, interstellar gas, dust, and dark matter, bound together by gravity.

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What is the role of dark matter in the universe?

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Dark matter is a form of matter that does not emit light or energy, making it invisible, but it exerts gravitational effects on visible matter.

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What is the difference between a star and a planet?

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A star is a luminous celestial body made of plasma that generates energy through nuclear fusion, while a planet is a celestial body that orbits a star and does not produce its own light.