| 1. | Achieving a closed orbit is not essential to lunar and interplanetary voyages.
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| 2. | Experts believe that the Moon has stabilized into a slightly closer orbit.
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| 3. | Sometimes it would go into a close orbit, but it wasn't a figure-8.
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| 4. | However there exist other force fields, which have some closed orbits.
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| 5. | I'm still fascinated by the close orbits of Sadler and Beilhart.
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| 6. | Harmonic and subharmonic orbits are special types of such closed orbits.
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| 7. | A closer orbit is slower, but gets round the Earth faster.
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| 8. | I would predict a range of instability between the distant orbit and close orbit.
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| 9. | All closed orbits have the shape of an ellipse.
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| 10. | Finding a brown dwarf in close orbit of a sun-like star is a rare event.
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