| 41. | Astronomers say this is Mars'closest approach to Earth since 1988.
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| 42. | Opportunities for observation and exploration due to this rare close approach are already on track.
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| 43. | Its next closest approach to Earth is in 2024.
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| 44. | Pioneer 10's closest approach was 446, 250 / km.
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| 45. | On Monday, the comet will make its closest approach to Earth _ 10 million miles.
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| 46. | The next close approach will occur during August 2023.
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| 47. | It will also be making close approaches to two other Jovian moons, Europa and Callisto.
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| 48. | Rebel forces allegedly attacked the town Monday, marking their closest approach to the capital itself.
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| 49. | It also makes close approaches to Mars and Venus.
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| 50. | Their closest approach to one another occurs in May.
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