The moon’s largest impact basins—those we can see with our eyes, without the aid of instruments—were formed by very large asteroids or comets striking the surface early in the moon’s history. In order to assess the stratigraphy, sequence, and ages of impact basins and the impactor population as a function of time, we have used topography from the Lunar Orbiter Laser Altimeter (LOLA) on Stratigraphic relationships show that SPA is the oldest impact basin on the Moon, but scientists are intensely interested in just how old it is. According to Fassett et al. Mishqui Basin (printed on the Rand McNally moonmap, north of Abbot). Lost Basin (NASA name, see LPOD US-1 and Other Signposts). Smokey Basin (NASA name, see LPOD US-1 and Other Signposts). Scientists hypothesize that the Moon's crust is twice as thick. It was created after the heavy bombardment period and is estimated to be 3.8 billion years old. The very largest impact features on the Moon are the enormous impact basins: great circular plains from 300 to more than a thousand kilometers across
Lunar samples suggest that most of the major basins on the Moon formed around 3.9 billion years ago in a period called the late heavy bombardment. After a long period of impacts, the Moon's impact basins filled with. Lava. When the Moon was relatively young, its interior was still molten.
The Altai Scarp is a very prominent piece of the main 860 km wide rim of the Nectaris impact basin. Basins are giant craters larger than 300 km that have two or more concentric rims and no central peak. The easiest basin structure to see on the near side of the Moon surrounds Mare Nectaris. But the Moon's big craters are well preserved. Impact Basin, Fig. INTRODUCTION. Mountain building processes, plate subduction, erosion, volcanism, and other processes cover or consume impact craters. Because the bottoms of impact basins were often the lowest places on the surface of the Moon, the erupting lava would flow into them and begin to fill them. Impact basins (), large circular structures characterized by two (peak-ring basins) or more (multiring basins) concentric topographic rings (2–4), have long been recognized on the Moon.Imaging and topographic mapping permitted the determination of basin ring dimensions, spacing, and morphology and elucidated how these characteristics change with increasing basin size (1–7). Rima Ariadaeus, photo by Apollo 10, 1969 . It's about 1,600 miles across (2,500 kilometers).
[1] Impact basin formation is a fundamental process in the evolution of the Moon and records the history of impactors in the early solar system. According to the most commonly accepted theory of the Moon's formation, the Moon is made from. So the record on Earth, limited to ~160 impact craters, is only the surviving trace of the millions of impact cratering events that have affected our planet. The Moon's major impact basins A map of the major lunar impact basins on the nearside (left) and farside (right). Impact basins (), large circular structures characterized by two (peak-ring basins) or more (multiring basins) concentric topographic rings (2–4), have long been recognized on the Moon.Imaging and topographic mapping permitted the determination of basin ring dimensions, spacing, and morphology and elucidated how these characteristics change with increasing basin size (1–7). Additional list of unofficially named (so-called) basins on the moon's near side: Loro Basin (printed on the Rand McNally moonmap, west of Airy).
During that time, the Moon was pummeled with objects from space, and volcanoes flowed freely as well. INTRODUCTION. Ruin Basin (NASA name, see LPOD US-1 and Other Signposts). The South Pole-Aitken (SPA) basin is the largest and oldest recognized impact basin on the Moon. Mars and Mercury still bear the scars from their impacts, too. The layers of the Moon, from the surface inward, are the . It's diameter is roughly 2,500 km or 1,550 miles.
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