Article: Gravity in the Solar System

What force began the process that formed the solar system?

• Gravity

• Magnetism

• Electricity

• Nuclear force

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Approximately how many years ago did the solar system begin to form?

• 4.6 billion years ago

• 3.5 billion years ago

• 2.8 billion years ago

• 5.2 billion years ago

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What happens to the planets if the sun's gravity suddenly stopped?

• They would shoot off in the direction they were moving at that moment

• They would collapse into the sun

• They would stop moving

• They would move closer to each other

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What is at the center of the Milky Way galaxy that exerts a gravitational pull?

• A supermassive black hole

• A giant star

• A massive planet

• A cluster of asteroids

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Why don't the planets collapse into the sun despite its strong gravity?

• Because they are moving too fast and have momentum

• Because they are held by magnetic forces

• Because they are repelled by the sun's heat

• Because they are too far from the sun

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