7.15 Gravity Models

1. Where do larger objects (like stars and planets) form in space?

• everywhere
• inside nebulae
• only near other stars
• between galaxies
• inside stars

2. Which of these is a NOT place where a star could form?

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• 
• 
• Option 4

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3. Which of these shows the process by which gravity begins to make a star or planet?

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• 
• 

4. When the cloud begins to contract, what happens next? CHOOSE TWO

• The material on the edges gets blown out into space.
• More and more material clumps together
• Materials are drawn in from all parts of the cloud.
• Materials are only pulled in from some parts of the cloud.

5. As the object inside the cloud gets bigger, which of these does NOT happen?

• Even more material is drawn in by the increasing gravity.
• Materials are pulled in from all parts of the cloud.
• The object and the cloud begin to spin.
• The cloud flattens out into a disk.
• Materials are only pulled in from some parts of the cloud.

6. The rotation of the cloud causes it to...

• explode.
• form up into a sphere.
• spin out arms in a spiral.
• get dizzy.
• reduce the force of gravity.

8. This is a model of of the inner part of our solar system. What color circle is around Earth?

• Green
• Pink
• Blue
• Red
• This model doesn't show Earth.

9. Blue arrows show forces, and red arrows show motion. Which picture shows why Earth revolves?

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• 
• 
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• None of these models is correct.

10. This image shows the outer solar system, showing the objects farther away from the Sun than the asteroid belt. Pluto is shown in its orbit in the Kuiper Belt. The pink circle is a short-period comet which has very little mass when compared to the planets. What color circle is around Jupiter?

• Blue
• Orange
• Purple
• Green
• Red

11. The image below shows the outer solar system as described in #10. Which object (identify by color) has the *most* gravitational pull from the Sun in the positions shown?

• Blue
• Orange
• Purple
• Green
• Red