Gravity and Solar System

Which characteristic distinguishes a moon from other celestial bodies?

• A moon directly revolves around a star.

• A moon indirectly revolves around a star.

• A moon has an elliptical orbit around the sun.

• A moon is composed of gases that revolve around the sun.

The United States’ Apollo 11 mission was the first spaceflight that landed on the moon and the first moonwalk. , the astronauts were leaping lightly around the moon and floating back to the surface.

 If the astronaut were to leap on Earth they would be quickly pulled back down. Which of the following statements explains why astronauts are able to leap lightly on the moon as compared to Earth?

• They experience less atmospheric force than if they were on Earth.

• They experience less gravitational force than if they were on Earth.

• They experience more atmospheric force than if they were on Earth.

• They experience more gravitational force than if they were on Earth.

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Which planet exerts the strongest gravitational force in our solar system?

• • Earth

• • Jupiter

• • Mars

• • Saturn

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What does the strength of gravitational force depend on?

 

• mass and distance

• mass and speed

• shape and speed

• shape and distance

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An astronomer is looking through a powerful telescope and observes many celestial objects orbiting the sun. He observes one with rock, ice, and a long tail.

What celestial object is he most likely looking at?

• Comet

• Dwarf planet

• Planet

• Asteroid

Most asteroids are found in our solar system between the orbits of

• • Mars and Jupiter in the main asteroid belt.

• • Venus and Earth in the main asteroid belt.

• • Saturn and Uranus in the main asteroid belt.

• • Mercury and Mars in the main asteroid belt.

Which of the following requirements must be met for an object to be considered a planet?  

• It directly revolves around a star.

• It has a nearly spherical shape.

•   It has cleared the neighborhood around it.

• All of the above.

Why does Earth constantly revolve around the sun?  

• Earth is attached to the sun by a gravitational force that operates like a rigid pole.

• Earth is pushed away from the sun due to the heat waves that are produced by the sun.

• Earth’s speed allows it to resist the pull of the gravitational force between Earth and the sun.

• Earth is caught in the gravitational force between Venus and Mars, causing it to rotate.

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Which statement is true about the relationship between the mass of a planet and its gravitational pull?

 

• The larger the mass of a planet, the greater its gravitational pull.

• The larger the mass of a planet, the smaller its gravitational pull.

• The smaller the mass of a planet, the greater the gravitational pull.

• The smaller the mass of a planet, the same the gravitational pull.

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Which of these statements is true regarding the number of moons in the solar system?

• There are no planets that do not have a moon.

• All moons in the solar system have been discovered.

• Planets in the solar system never have more than five moons

• Planets in the solar system have different numbers of moons.