Unit 7- Solar System

Which of the following best describes the role of gravity in the formation of planets and stars?

• Gravity repels objects, causing them to move apart.

• Gravity pulls objects together, leading to the formation of planets and stars.

• Gravity has no effect on the formation of celestial bodies.

• Gravity only affects objects on Earth.

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Explain how the Law of Universal Gravitation affects the motion of planets in the solar system.

• It causes planets to move in straight lines.

• It keeps planets in orbit around the Sun due to gravitational attraction.

• It has no effect on planetary motion.

• It causes planets to stop moving.

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Compare the geocentric and heliocentric models of the solar system.

• Both models place the Sun at the center of the universe.

• The geocentric model places Earth at the center, while the heliocentric model places the Sun at the center.

• Both models place Earth at the center of the universe.

• The heliocentric model places Earth at the center, while the geocentric model places the Sun at the center.

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Discuss the impact of the heliocentric model on our understanding of the solar system.

• It confirmed that Earth is the center of the universe.

• It provided evidence that planets orbit the Sun, changing our understanding of the solar system.

• It suggested that the Sun orbits Earth.

• It had no impact on our understanding of the solar system.

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Which of the following properties is unique to Earth compared to other planets in the solar system?

• Earth has a thick atmosphere composed mainly of hydrogen.

• Earth has liquid water on its surface.

• Earth is the largest planet in the solar system.

• Earth has the fastest rotation speed.

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Compare the gravitational force of the Sun to that of Earth.

• The Sun's gravitational force is weaker than Earth's.

• The Sun's gravitational force is stronger than Earth's, keeping planets in orbit.

• Both have the same gravitational force.

• Earth's gravitational force affects the Sun's orbit.

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How has technology advanced our ability to explore outer space?

• Technology has made space exploration more difficult.

• Technology allows us to collect samples and data from remote locations in space.

• Technology has no impact on space exploration.

• Technology only helps in communication on Earth.

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Evaluate the role of satellites in modern space exploration.

• Satellites are only used for television broadcasts.

• Satellites are crucial for data collection, communication, and navigation in space exploration.

• Satellites have no role in space exploration.

• Satellites are used only for weather forecasting.

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Compare the uses of different parts of the electromagnetic spectrum in space exploration.

• Only visible light is used in space exploration.

• Different wavelengths are used for various purposes, such as infrared for heat detection and radio waves for communication.

• The electromagnetic spectrum is not used in space exploration.

• Only gamma rays are used in space exploration.

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Explain how gravity influences the motion of moons around planets.

• Gravity causes moons to move away from planets.

• Gravity keeps moons in orbit around planets.

• Gravity has no effect on moons.

• Gravity causes moons to collide with planets.

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