9.1 Review- Movement in Space

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What is the geocentric model?

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The geocentric model is an astronomical theory that places Earth at the center of the universe, with all other celestial bodies orbiting around it. This model was developed by Ptolemy.

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Who was Ptolemy?

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Ptolemy was an ancient Greek scientist who proposed the geocentric model of the universe, suggesting that Earth is the center of all celestial movements.

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What did Tycho Brahe observe about planetary movement?

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Tycho Brahe observed that planets did not move in perfect circles around the sun, leading to new understandings of planetary motion.

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What is a meteor?

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A meteor is a streak of light produced when a small piece of rock enters Earth's atmosphere and burns up due to friction with the air.

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What is the difference between rotation and revolution?

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Rotation is the spinning of an object around its own axis, while revolution is the movement of an object around another object in an orbit.

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How does Earth rotate and revolve around the Sun?

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Earth rotates on its axis, which takes about 24 hours, and it revolves around the Sun in an elliptical orbit, taking about 365 days.

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Who proposed that Earth's rotation and revolution explained the movement of stars?

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Copernicus proposed that Earth's rotation and revolution around the Sun explained the apparent movement of stars in the sky.

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What is the heliocentric model?

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The heliocentric model is an astronomical theory that places the Sun at the center of the universe, with Earth and other planets orbiting around it.

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What did Copernicus contribute to astronomy?

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Copernicus contributed the heliocentric model of the universe, which challenged the geocentric model and laid the groundwork for modern astronomy.

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What is the significance of Kepler's laws of planetary motion?

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Kepler's laws describe the motion of planets around the Sun, stating that orbits are elliptical, planets move faster when closer to the Sun, and the square of the orbital period is proportional to the cube of the semi-major axis of the orbit.