| our solar system | 0.44 |
| orbit | 0.35 |
| equilibrium | 0.28 |
| orbit the sun | 0.83 |
| revolve around the sun | 0.80 |
| travel around the sun | 0.58 |
| orbit star | 0.58 |
| orbit other stars | 0.54 |
| rotate in same direction | 0.54 |
| rotate on their axes | 0.51 |
| support life | 0.50 |
| move in their orbits | 0.41 |
| pass in front of the st… | 0.40 |
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| circular orbits | 0.57 |
| moon | 0.48 |
| same composition | 0.47 |
| magnetic field | 0.41 |
| atmosphere | 0.33 |
| satellite | 0.28 |
| ring | 0.28 |
| their ending | 0.25 |
| characteristic | 0.16 |
| celestial body | 0.38 |
| two distinct classes of… | 0.31 |
| object | 0.28 |
| formed | 0.62 |
| discovered | 0.58 |
| formed in same period | 0.44 |
| inhabited | 0.41 |
| created | 0.41 |
| run by the sun | 0.37 |
| separated | 0.35 |
| destroyed | 0.33 |
| close to each other | 0.28 |
| known to ancient | 0.25 |
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