Motion in Space

What would happen to the planets if there was no gravity from the Sun?

• They would continue to orbit the Sun.

• They would move in a straight line into space.

• They would fall into the Sun.

• They would stop moving completely.

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TEKS.SCI.7.9B

Which of the following is a result of gravity acting on the planets in the solar system?

• Planets have a fixed position in space.

• Planets orbit the Sun in elliptical paths.

• Planets are stationary.

• Planets repel each other.

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TEKS.SCI.7.9B

What is the primary reason that planets do not fly off into space?

• The Sun's magnetic field

• The gravitational pull of the Sun

• The planets' own gravity

• The vacuum of space

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TEKS.SCI.7.9B

Which of the following best explains why the Earth orbits the Sun?

• The Earth's magnetic field

• The gravitational attraction between the Earth and the Sun

• The Earth's rotation

• The Sun's light

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TEKS.SCI.7.9B

What would happen to the Earth's orbit if the Sun's gravity suddenly disappeared?

• The Earth would continue to orbit the Sun.

• The Earth would move in a straight line into space.

• The Earth would fall into the Sun.

• The Earth would stop moving completely.

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TEKS.SCI.7.9B

Discuss the impact of gravitational forces on the motion of celestial bodies in the solar system.

• Gravitational forces have no impact on celestial bodies.

• Gravitational forces cause celestial bodies to move in predictable orbits.

• Gravitational forces cause celestial bodies to move randomly.

• Gravitational forces only affect the Sun.

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TEKS.SCI.7.9B

Describe how the gravitational pull of the Sun influences the orbits of planets in the solar system.

• It causes planets to move in random directions.

• It keeps planets in elliptical orbits around the Sun.

• It has no effect on the orbits of planets.

• It causes planets to collide with each other.

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TEKS.SCI.7.9B

How does the gravitational interaction between the Sun and the planets affect the stability of the solar system?

• It destabilizes the solar system by causing erratic orbits.

• It stabilizes the solar system by maintaining consistent orbits.

• It has no effect on the stability of the solar system.

• It causes planets to leave the solar system.

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TEKS.SCI.7.9B

Which of the following best describes the movement of the Sun in the Milky Way galaxy?

• The Sun is stationary in the galaxy.

• The Sun orbits the center of the Milky Way galaxy.

• The Sun moves randomly through the galaxy.

• The Sun moves towards the edge of the galaxy.

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TEKS.SCI.7.9A

How does the gravitational force between the Earth and the Sun affect the length of a year on Earth?

• It causes the year to be shorter.

• It determines the length of a year by keeping Earth in orbit.

• It has no effect on the length of a year.

• It causes the year to be longer.

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TEKS.SCI.7.9B