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Crater Chains on the Earth and Moon (910 words) |
 | A crater chain is formed when an asteroid or comet with low tensile strength is pulled apart by tides during a close approach to a planet, separating into a train of fragments which hit a moon of the planet rather than escaping to interplanetary space. |
| First, the structures filling in the gaps in the Missouri crater chain between Decaturville and Crooked Creek may not be of impact origin, implying this chain may not be a chain at all. |
| Second, the Aorounga impact crater and the ~10 km circular structure adjacent to it may be an example of a doublet crater, produced by the impact of a binary asteroid (Bottke and Melosh 1996). |
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Moon - Wikipedia, the free encyclopedia (5253 words) |
| The gravitational attraction that the Moon exerts on Earth is the cause of tides in the sea. |
| The tidal bulges on Earth, caused by the Moon's gravity, are carried ahead of the apparent position of the Moon by the Earth's rotation, in part because of the friction of the water as it slides over the ocean bottom and into or out of bays and estuaries. |
| The points where the Moon's orbit crosses the ecliptic are called the "lunar nodes": the North (or ascending) node is where the Moon crosses to the North of the ecliptic; the South (or descending) node where it crosses to the South. |
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