| 21. | This is its closest approach to the center of the Earth.
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| 22. | They were able to image it though during their close approaches.
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| 23. | Not until 1989 was a closer approach ( by 4581 Asclepius ) observed.
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| 24. | Hale-Bopp's closest approach, which occurred Saturday night, was 122 million miles.
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| 25. | It currently makes closer approaches to Mars than it does Earth.
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| 26. | It has made and will continue to make many close approaches to Earth.
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| 27. | He added that NASA had not given up yet on the close approach.
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| 28. | Although they are wary, chipping sparrows often allow close approach.
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| 29. | This week it makes its closest approach in 95 years.
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| 30. | The bus made a flyby with a closest approach of.
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