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In 2002 a mid-sized asteroid (50-120 metres across) missed Earth by 121, 000km one-third of the distance to the moon.
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The asteroid, which is 140 meters (460 feet) in diameter, will get no closer to Earth than 890, 000 kilometers (553, 000 miles), or more than twice the distance to the moon, NASA said.
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But the size of the Earth is a few percent of the distance to the moon, which translates to about a 7% stronger gravitational pull on the near side of the Earth than the far side.
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"For the May eclipse, the moon will be at the furthest distance from Earth that it ever achieves -- meaning that it will block the smallest possible portion of the sun, and leave the largest possible bright ring around the outside, " the agency said on its website.
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The truth that the moon was pulling the water at a distance seemed to him obvious nonsense, and he never tired of mocking it.
NEWYORKER: Moon Man
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During that time, the GRAIL satellites will be tracking the distance between each other as the Moon passes beneath them.
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According to Weidner, schoolchildren in the 1960s were taught that the distance from the Earth to the Moon was 237, 000 miles.
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Since the gravity of the Moon is different at different portions of the Moon, this will cause slight changes to the distance between the two satellites.
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Anyone able to perceive the Great Wall from the moon would have to have an eye keen enough to see a human hair from a distance of two miles.
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In their paper, the co-authors argue that gravitational tidal heating caused by the gravitational friction of an earth-like exo-moon on an eccentric orbit around a Jupiter-like planet lying at a Jupiter-like distance from its parent star, could, in fact, create habitable conditions.
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