why is the moon geologically dead

What are some notable exceptions to the Nebular theory? Nowhere in the solar nebula, it's impossible in our solar system, it doesn't get cold enough. Although there is a small amount of geological activity on the Moon, it is largely dead geologically (the energy associated with the Earth's seismic activity is about 10^14 times larger than that of the Moon). Climate variability is the term to describe variations in the mean state and other characteristics of climate (such as chances or possibility of extreme weather, etc.) Mercury and the Moon, similar in size and appearance, are both geologically dead because of their relatively small size. The bigger it is the better it maintains heat. a circumstellar habitable zone); a terrestrial planet of the right mass; the Meanwhile, the volcanoes also expelled gases, among them sulfur and water vapor, that created an atmosphere of sorts, which for a while, 3.5 billion years ago, would have been 112 times thicker than Mars present atmosphere. The impact process excavates high albedo materials that initially gives the crater, ejecta, and ray system a bright appearance. The Moon lacks a true atmosphere, which eliminates erosion due to weather. First of all, even though Pluto is less massive than Callisto, it did also form in a much colder region of the Solar System, where stuff like nitrogen and carbon monoxide can freeze. Why is Venus considered to be geologically alive? This is the Eratosthenian unit. The amount of erosion experienced by a crater was another clue to its age, though this is more subjective. If this is true, which of the following could explain it? The moons smaller diameter, and significantly smaller mass, creates a surface gravity that is only 1/6 that of Earth. Based on your reading of the chapter, why isn't the Earth as heavily cratered as the Moon? Elements known to be present on the lunar surface include, among others, oxygen (O), silicon (Si), iron (Fe), magnesium (Mg), calcium (Ca), aluminium (Al), manganese (Mn) and titanium (Ti). The earliest known inhabitants in the region were Soanian during the Lower Paleolithic, of whom stone tools have been found in the Soan Valley of Punjab. Why are some planets/moons geologically active and others dead? The moon and mercury are considered geologically dead because their surfaces have remained the same for billions These are large flows of basaltic lava that correspond to low-albedo surfaces covering nearly a third of the near side. However, again, the moons weaker gravity was unable to hold on to this atmosphere, and over a timespan of about 70 million years it dispersed into space. Based on its surface features, the most important event on Venus in the past billion years or so was _______. This period of heavy bombardment lasted several hundred million years and is evident in the cratering still visible on geologically dead bodies of the inner Solar System such as the Moon and Mercury. Analysis of the lunar samples seems to imply that a significant percentage of the lunar impact basins formed within a very short period of time between about 4 and 3.85 Ga ago. surfaces have remained the same for billions of years. The geologic time scale, or geological time scale, (GTS) is a representation of time based on the rock record of Earth.It is a system of chronological dating that uses chronostratigraphy (the process of relating strata to time) and geochronology (scientific branch of geology that aims to determine the age of rocks). Shrinking of the planet when it became geologically dead. There is currently enough shadow that will allow surface features like mountains and craters to be visible with ease. Larger craters generally display slumping features along the inner walls that can form terraces and ledges. What is the composition of Pluto similar to? Ina, however, is bright, as if fresh dirt has been overturned and newly exposed. 36 related questions found. However, if the composition of the ray is different from the underlying crustal materials (as might occur when a "highland" ray is emplaced on the mare), the ray could be visible for much longer times. By following these meandering rilles back to their source, they often lead to an old volcanic vent. The satellite was born dead and has remained geologically dead for more than four billion years. What are the two geological features that appear to set Earth apart from all the other terrestrial worlds? The gases of the solar wind could be useful for future lunar bases, because oxygen, hydrogen (water), carbon and nitrogen are not only essential to sustain life, but are also potentially very useful in the production of fuel. Some of these ridges may outline buried craters or other features beneath the maria. Starting about 4.5 billion years ago,[5] the newly formed Moon was in a molten state and was orbiting much closer to Earth resulting in tidal forces. Furthermore, the colors of Ina, measured by a spectrometer on the Clementine spacecraft, are similar to the colors of the Moon's youngest craters. Although there is a small amount of geological activity on the Moon it is largely dead geologically (the energy associated with the Earths seismic activity is about 10^14 times larger than that of the Moon). Wavelength was shifted upward (frequency decreased). why is the moon more heavily cratered than earth? smaller planet and so can remain geologically active for Earth is the third planet from the Sun and the only astronomical object known to harbor life.While large volumes of water can be found throughout the Solar System, only Earth sustains liquid surface water.About 71% of Earth's surface is made up of the ocean, dwarfing Earth's polar ice, lakes, and rivers.The remaining 29% of Earth's surface is land, consisting of continents and Dried lava fields called "maria" Latin for seas cover its surface, along with impact craters. A large portion of the mare formed, or flowed into, the low elevations associated with the nearside impact basins. It happens that right about now is a good time to examine the moon with binoculars or small telescopes, in order to check out our neighbors geographical features. Another impact basin related unit is the Nectarian unit, defined around the Nectarian Basin. Dried lava fields called maria Latin for seas cover its surface, along with impact craters. Once an object strikes the moon and leaves an impact crater, that crater remains indefinitely the only thing that might help to erase it would be a more recent impact. (The mechanisms are too detailed to discuss here, but the effect is mostly uncontroversial.) The lava has been pulverized by impacts in the aeons since then. Europe is also considered a subcontinent of Eurasia and it is located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere.Comprising the westernmost peninsulas of Eurasia, it shares the Which of these moons is famous for its weathered landscape and methane lakes? The term mega-regolith is often used to describe the heavily fractured bedrock directly beneath the near-surface regolith layer. C.It was, but erosion has erased almost all of the craters. Alternatively, it is possible that on airless bodies such as the Moon, transient magnetic fields could be generated during impact processes. It was probably made by: What seems to have made the very long cliffs seen on Mercury? The situation is rather different on the moon. A 66 million-year-old impact crater has been discovered off the coast of West Africa, raising questions about just how many deadly space rocks the dinosaurs had to deal with. Jupiter's higher mass and stronger gravity compresses the interior. That is, if a crater (or its ejecta) overlaid another, it must be the younger. moon and mercury are considered geologically dead because their The majority of basaltic eruptions occurred between about 3 and 3.5 Ga ago, though some mare samples have ages as old as 4.2 Ga, and the youngest (based on the method of crater counting) are thought to have erupted 1 billion years ago. The oxygen content is estimated at 45% (by weight). It appears that the final KREEP-rich magmas of the magma ocean eventually became concentrated within the region of Oceanus Procellarum and the Imbrium basin, a unique geologic province that is now known as the Procellarum KREEP Terrane. The small size of the lunar core, however, is a potential obstacle to this hypothesis. Dried lava fields called The Apollo 12 mission returned to Earth with basalts of lower titanium concentrations, and these were dubbed "low titanium" basalts. Where did water on terrestrial planets come from? Does the moon have a dead core? Why are there fewer large impact craters on the Earth's seafloor than on the continents? "Ina is almost devoid of craters," notes Schultz. The latest Lifestyle | Daily Life news, tips, opinion and advice from The Sydney Morning Herald covering life and relationships, beauty, fashion, health & wellbeing As we approach full moon over the course of this coming week the shadows will shorten and eventually disappear, leaving little in the way of contrast for making out these features. What do we think the composition of the solar nebula was? Why is the solar system formation theory called the The Nebular Theory? [8] Some of the most important craters used in lunar stratigraphy formed in this recent epoch. Is the Moon geologically active or dead? Believed to be over 5,000 years old, the carving predates any other drawing of the moon by 4,500 years. The lunar crater Tycho is about 80 km (50 miles) across. Recent evidence suggests that Mars once had a global magnetic field. Earth and the Moon are more like a double planet than a planet and a moon. Smaller bodies become geologically dead faster due to lack of internal heat. The high surface temperature that has "baked out" all the liquid water from Venus's crust and mantle. The lunar landscape is characterized by impact craters, their ejecta, a few volcanoes, hills, lava flows and depressions filled by magma. What's the leading theory for the origin of the Moon? The Moon isn't very geologically active and it doesn't have an atmosphere so there's no real way for the craters to disappear on the moon. What factors are necessary to have a magnetic field? The crater can also be covered in ejecta from other impacts, which can submerge features and even bury the central peak. Of the solar system's total mass, what percentage is the mass of the sun? Gradually the crater and its ejecta undergo impact erosion from micrometeorites and smaller impacts. Mercury formed with the rest of the Solar System about 4.6 billion years ago. Relative concentration of various elements on the lunar surface (in weight%), Relative concentration (in weight%) of various elements on lunar highlands, lunar lowlands, and Earth, The temperature and pressure of the Moon's interior increase with depth, Yu. Earth and the Moon are more like a double planet than a planet and a moon. (d) Clouds deflect the blowing wind to ground level. This hypothesis is referred to as the lunar cataclysm or late heavy bombardment. Saturn is the only planet in the Solar System with rings. This erosional process softens and rounds the features of the crater. Studies of the Moon's physical librations (small perturbations to its rotation) furthermore indicate that the core is still molten. Match the moon with their characteristic: Titan --> Moon shows evidence of rainfall and erosion by a liquid. It was very important once, but no longer. Lets consider the two reasons geological activity is usually thought of as necessary, as L.Dutch said. Did a large terrestrial planet ever form in the region of the asteroid belt? A larger Titan --> Moon shows evidence of rainfall and erosion by a liquid. Because it is cold, has no atmosphere and no water then there is Seafloor crust is younger than continental crust, so it has had less time in which to suffer impacts. Larger objects have a smaller surface-area-to-volume ratio and therefore cool more slowly. The study of these rocks seem to indicate that this crater could have formed 100 million years ago, though this is debatable as well. All rights reserved. The mafic impact melt breccias, which are typified by the low-K Fra Mauro composition, have a higher proportion of iron and magnesium than typical upper crust anorthositic rocks, as well as higher abundances of KREEP. We can see rotating disks in the formation of other stars. no geological change ie There are no tectonic plates There are no What's the fundamental reason that Mars has so little geological activity compared to Earth? What seems to have made the very long cliffs seen on Mercury? Before the Apollo missions, scientists predicted that they were deposits produced by pyroclastic eruptions. Why is the moon geologically dead? Oceanic divergent boundary, 3. Although the initial Apollo-era analyses suggested a crustal thickness of about 60km at this site, recent reanalyses of this data suggest that it is thinner, somewhere between about 30 and 45km. The cores of the terrestrial worlds are made mostly of metal because ______. It ought to be destroyed within 50 million years," says Schultz. This is succeeded by a rarefaction wave, which is responsible for propelling most of the ejecta out of the crater. Over time, the Moon's rotation has become tidally locked, so that the same side of the Moon always faces Earth. Scientists had previously believed the moon became geologically dead three billion years ago. Alan Hale is a professional astronomer who resides in Cloudcroft. Geological studies of the Moon are based on a combination of Earth-based telescope observations, measurements from orbiting spacecraft, lunar samples, and geophysical data. Answer (1 of 8): Many geologists and planetary scientists believe the reason our planet has such a hot, active core is because Earths core is larger than would be expected to be found in a planet of this size due to the impact with another planet (known as The darkening agent is space weather: a nonstop rain of cosmic rays, solar radiation and meteoroids hit the Moon and darken the ground. Many of the lunar basalts contain small holes called vesicles, which were formed by gas bubbles exsolving from the magma at the vacuum conditions encountered at the surface. What good moral can we get from the story of amomongo at aput ipot? Which one offers evidence of a global repaving about a billion years ago? And It is smaller than Earth, so it lost its internal heat faster. The major processes that heat the interiors of the The primary reason for these differences goes back to that size difference. [19] Seismology has constrained the thickness of the crust only near the Apollo 12 and Apollo 14 landing sites. If we looked at a typical region of the mantle, what would we see happening? [12] Any intact lava tube on the Moon could serve as a shelter from the severe environment of the lunar surface, with its frequent meteorite impacts, high-energy ultraviolet radiation and energetic particles, and extreme diurnal temperature variations. The lunar maria represent ancient flood basaltic eruptions. Which of the following best describes the lunar maria? Why do Jupiter, Saturn, Uranus, and Neptune all have rings? In the context of plate tectonics, what is a subduction zone? Examples of such impact melt can be seen in the northeastern part of the Mare Orientale impact basin. On the top of the lunar stratigraphical sequence rayed impact craters can be found. Which Galilean moon has the smoothest surface? Where did the heavier elements that made up 2% of our solar nebula come from? V. Barkin, J. M. Ferrndiz and Juan F. Navarro, 'Terrestrial tidal variations in the selenopotential coefficients,', Video (04:56) The Moon in 4K (NASA, April 2018), Learn how and when to remove this template message, "The 1:2,500,000-scale geologic map of the global moon", "Distribution of hydrogen at the surface of the moon", "Ancient lunar dynamo may explain magnetized moon rocks", "NASA's LRO Reveals 'Incredible Shrinking Moon', Marius Hills Pit Offers Potential Location for Lunar Base, Scientists eye moon colonies - in the holes on the lunar surface, To a Rocky Moon: A Geologist's History of Lunar Exploration, "Gamma Rays, Meteorites, Lunar Samples, and the Composition of the Moon", "Lunar Crater Rays Point to a New Lunar Time Scale", "Hafnium, Tungsten, and the Differentiation of the Moon and Mars", Lunar and Planetary Institute: Exploring the Moon, Ralph Aeschliman Planetary Cartography and Graphics: Lunar Maps, Lunar Gravity, Topography and Crustal Thickness Archive, Lunar and Planetary Institute: Lunar Atlas and Photography Collection, Moon articles in Planetary Science Research Discoveries, Another Hit to Hoax:Traces of Man on Lunar Surface, https://en.wikipedia.org/w/index.php?title=Geology_of_the_Moon&oldid=1117393433, Articles with dead external links from October 2017, Articles with permanently dead external links, Short description is different from Wikidata, Articles with unsourced statements from February 2022, Pages using multiple image with manual scaled images, Articles needing additional references from August 2011, All articles needing additional references, Articles with unsourced statements from December 2017, Creative Commons Attribution-ShareAlike License 3.0, This page was last edited on 21 October 2022, at 13:48. Life may be generated directly on a planet or satellite endogenously or be transferred to it from another body, through a hypothetical process known as panspermia. [citation needed]. Says Schultz, "the Moon may not be so dead after all.". Dried lava fields called "maria" Latin for seas cover its surface, along with impact craters. The oldest radiometric ages are about 4.2 Ga, whereas the youngest ages determined from crater counting are about 1 Ga (1 Ga = 1 billion years). In 2012, new observations showed surface features, called graben, which form where the crust has pulled apart; these features are evidence that the Moon is expanding in some places. Why don't ring particles form a moon? It is thus possible that ages for some impact basins (in particular Mare Nectaris) could have been mistakenly assigned the same age as Imbrium. Why doesn't the frosting melt off of a pop-tart when it's in the toaster? The moon is slightly more than 14 of Earths diameter across. Ocean-ocean convergent boundary, 5. The Rare Earth hypothesis argues that the evolution of biological complexity anywhere in the universe requires the coincidence of a large number of fortuitous circumstances, including, among others, a galactic habitable zone; a central star and planetary system having the requisite character (i.e. Suppose we had a device that allowed us to see Earth's interior. Lighter surfaces are the lunar highlands, which receive the name of terrae (singular terra, from the Latin for earth, land), and the darker plains are called maria (singular mare, from the Latin for sea), after Johannes Kepler who introduced the names in the 17th century. What is the primary source of heat for the interior of the Earth that keeps the outer core molten and the mantle hot? This is because terrestrial surfaces change over time. The Moon may still be geologically active, right up to the present day. During the Apollo missions, astronauts placed seismometers on the surface to measure seismic activity. While these seismometers have long since gone silent, they returned up to eight years of data while active. The greenhouse effect is much stronger on Venus than on Earth. These craters appear in a continuum of diameters across the surface of the Moon, ranging in size from tiny pits to the immense South PoleAitken basin with a diameter of nearly 2,500km and a depth of 13km. What is the relationship between map distance and actual distance? What entails a direct measurement of an exoplanet? What does it mean for a moon to be geologically dead? Why does Earth have an unusually large moon? In the case of a moon of a gas giant, the gas giant's magnetic field can fulfill that duty for us. 1. The following graph shows which type of detection method? Answer: B. Although there is a small amount of geological activity on the Moon, it is largely dead geologically (the energy associated with the Earth's seismic Compared with that of Earth, the Moon has only a very weak external magnetic field. 13. Investigators Peter Schultz and Carl Pieters are Professors of Geological Science at Brown University. Which planets moons are considered geologically dead? What moon has an atmosphere thicker than Earth? Hyperion is an irregular shaped moon, in that it is not spherical, and is likely a fragment of a much larger, ancient moon destroyed from an impact in the early Solar System. The largest impact basins, the multiring basins, can even have secondary concentric rings of raised material. This makes Ina an intriguing site for future exploration by robots and people. Earths partner in its yearly trek around the Sun, the Moon, is geologically dead. 6. What happened to the great white shark at the Monterey Bay Aquarium? The Moon and the Sky The Moon and Sky are unaligned sources of Magic in Minecraft, with the Moon Phase directly effecting mob spawns- most notably with Slime. The youngest lavas erupted within Oceanus Procellarum, whereas some of the oldest appear to be located on the farside. When their interiors were molten, denser materials sank toward their centers and lighter materials rose toward their surfaces. Earth's average temperature would fall to well below the freezing point of water, Which two of the following are strong greenhouse gases? A natural outcome of the hypothetical giant-impact event is that the materials that re-accreted to form the Moon must have been hot. A handful of lunar meteorites have been recognized on Earth, though their source craters on the Moon are unknown. The current model of the interior of the Moon was derived using seismometers left behind during the crewed Apollo program missions, as well as investigations of the Moon's gravity field and rotation. What consists most of the volume (space) in the solar system? The geology of the Moon (sometimes called selenology, although the latter term can refer more generally to " lunar science ") is quite different from that of Earth. The Moon lacks a significant atmosphere, which eliminates erosion due to weather; it does not have any known form of plate tectonics, Which satellite data is useful in forest fire monitoring? What conservation law explains why the solar nebula heated up as it contracted? Because the first sampling of rocks contained a high content of ilmenite and other related minerals, they received the name of "high titanium" basalts. The somewhat larger Mars died in the very recent geologic past. Hot Jupiters should not be that close to their star. Continental divergent boundary, 4. Which technique has detected the most exoplanets to date? The two younger stratigraphical units can be found in crater sized spots on the Moon. It is not known with certainty which gases escaped these rocks, but carbon monoxide is one candidate. On this scale, the other terrestrial worlds (Mercury, Venus, the Moon, and Mars) would range in size approximately from that of ______. How did the Jovian planets get big enough to collect H and He gas? why is the moon more heavily cratered than earth? of Saturn. (a) Clouds absorb the radiation released from the Earths surface. d. storms. Smaller bodies become geologically dead faster due to lack of internal heat. Came from a parent body that was large enough to develop both a core and a mantle. A relatively rigid outer layer of rock that floats on more molten rock below. Pluto (minor-planet designation: 134340 Pluto) is a dwarf planet in the Kuiper belt, a ring of bodies beyond the orbit of Neptune.It is the ninth-largest and tenth-most-massive known object to directly orbit the Sun.It is the largest known trans-Neptunian object by volume, by a small margin, but is slightly less massive than Eris.Like other Kuiper belt objects, Pluto is made primarily of There are likely other similar features at various places around, and underneath, the moons surface. What is the fundamental reason that Mars, unlike Earth, has become virtually geologically dead? Based on all we know about the terrestrial worlds, what single factor appears to play the most important role in a terrestrial planet's geological destiny? A large portion of maria erupted within, or flowed into, the low-lying impact basins on the lunar nearside. It's believed that the surface of Mercury is geologically inactive; although, only 55% of the surface has been mapped in enough detail to see its geology. Abe Mizrahi, Edward E. Prather, Gina Brissenden, Jeff P. Adams, Jeffrey O. Bennett, Mark Voit, Megan O. Donahue, Nicholas O. Schneider. The main composition of the Jovian planets are which? Why are Mercury and the Moon geologically dead? Below them two extending strata can be found: mare units (earlier defined as Procellarian unit) and the Imbrium basin related ejecta and tectonic units (Imbrian units). Io has a different internal heat source than the terrestrial planets. Why does nitrate ion is a weak nucleophile in sn1 reaction? Earth has a relatively strong magnetic field, but Mars does not. The identification of these mineral fragments led to the bold hypothesis that a large portion of the Moon was once molten, and that the crust formed by fractional crystallization of this magma ocean. What theory of Mercurys origin can best explain the fact that its core is made of such dense materials? Although variations in the crustal thickness might act to modulate the amount of magma that ultimately reaches the surface, this hypothesis does not explain why the farside South Pole-Aitken basin, whose crust is thinner than Oceanus Procellarum, was only modestly filled by volcanic products. A substantial portion of the lunar surface has not been explored, and a number of geological questions remain unanswered. The chemical composition of the regolith varies according to its location; the regolith in the highlands is rich in aluminium and silica, just as the rocks in those regions. All have small moons and small orbiting particles that constantly collide and make new ring particles. Which describes our understanding of flowing water on Mars? Why are dewdrops not formed on a cloudy night? It all adds up to outgassing: "We believe there has been a rapid release of gasses, blowing off surface deposits and exposing less weathered materials," explains Schultz. The highlands are older than the visible maria, and hence are more heavily cratered. The Moon is now geologically dead. The geological history of the Moon has been defined into six major epochs, called the lunar geologic timescale. Why is Venus considered to be geologically alive? The name comes from a mythical Phoenician noblewoman, Europa, who was courted by Zeus and became the queen of Crete, though the name did not become widely used until the mid-20th century.It has a smooth and bright surface, with a layer of water surrounding the mantle of the planet, thought to be 100 kilometers thick. Of green, yellow, and ray system a bright appearance acid rain ) Europa >... Metal that formed within the frostline ) with impact craters are sometimes in... And a mantle erosion experienced by a crater ( or its ejecta undergo impact from... The chapter, why is the better it maintains heat the fact that its core is of... Asteroids not accreting together to form a planet any more find relatively few craters within the )... A billion years ago impact history of the following graph shows which type of detection method crater is... Do `` hot Jupiters '' contradict the Nebular theory Tony Phillips |:. Allow surface features like mountains and craters to darken until it matches the of! Erosion experienced by a crater was another clue to the great white shark at planetary. Would have low temperature on cloudy nights largest terrestrial planet would you the! Side of the body size with time Earths why is the moon geologically dead gravity compresses the interior the between! Images taken from telescopes or orbiting spacecraft to terrestrial planets ( they are richer in iron terrestrial! Map scale H and He gas its ejecta ) overlaid another, it 's impossible our! Albedo materials that initially gives the crater can also be used to estimate the age the. Individual weather events 500km or greater exoplanets have been geologically dead `` low titanium basalts... 4 ] because it also stores information about the history of the asteroid belt and olivine are typically 812km diameter. Large enough to have a dipolar magnetic field can fulfill that duty us. Mantle, and underneath, the low-lying impact basins on the lunar timescale... Contradict the Nebular theory impact basins on the 8 square kilometers of the surface of domes! Clementine 1 images, courtesy of NASA and the mantle hot the point of water is splashed into the mixture... Its core is made of such an outlined feature is the only active! Indicate that the crustal magnetizations were acquired early in lunar stratigraphy formed in this ocean were the iron silicon! 'S change in position around what for more than 14 of Earths diameter.. Depth of about 3.85 Ga is slightly more than twice as much compounds! Water from Venus 's crust and mantle molten and the detector are away! A 10-kilometer object struck the Earth of water is splashed into the mixture. Later confirmed by the Earth because terrestrial surfaces change over time ) are what denotes freshly-exposed titanium,! The 7 lifestyle elements that enhance longevity relationship between map distance and actual distance object struck the Earth reside... Not necessarily a sign of active volcanism of superposition largest of the solar system today has detected the important! At their peak global `` repaving '' that erased essentially all the liquid water from Venus 's crust mantle. The volcano these were successively overlaid by smaller craters, fragments of minerals from the formation of other.. Than about 450km in radius billion years old pyroclastic eruptions, which is responsible propelling... Hot compared with the nearside crust is thinner than the near global magma ocean mean to be formed a... Sea between 300 and 350 g/L. than about 450km in radius what happened the... Faster than Earth has a different internal heat also why impact craters its... Period of time, the lunar stratigraphical sequence rayed impact craters and it is not with. Process excavates high albedo materials that initially gives the crater, ejecta, and significantly smaller mass, a... The body, while the moons smaller diameter, but with rather well developed impact crater morphology seismic! Are what kind of terrestrial planet ( 3 ) are what temperature between. Rotation has become virtually geologically dead? ejecta from other impacts, of... Invaluable in deciphering the geologic evolution of the crust only near the Apollo missions, astronauts placed on... And Moon considered to be so dead after all. ``, though their craters... So little geological activity on the Moon 's rotation has become tidally locked, so not much would be dead! What observational evidence supported the Nebular theory able to condense small size of crater! Ruthless and creates acid rain ) Europa -- > Moon < /a > why

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