1.
Lyme Regis
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Lyme Regis /ˌlaɪmˈriːdʒɪs/ is a coastal town in West Dorset, England, situated 25 miles west of Dorchester and 25 miles east of Exeter. The town lies in Lyme Bay, on the English Channel coast at the Dorset–Devon border and it is nicknamed The Pearl of Dorset. The town is noted for the found in the cliffs and beaches. The town was home to Admiral Sir George Somers, its one-time mayor and he founded the English colonial settlement of the Somers Isles, better known as Bermuda. Lyme Regis is twinned with St. Georges, Bermuda, in July 2015 Lyme Regis was also tripled with Jamestown, Virginia to form the Historic Atlantic Triangle between Lyme, St Georges and Jamestown. In the 2011 Census the towns parish and the ward had a population of 3,671. In Saxon times, the abbots of Sherborne Abbey had salt-boiling rights on land adjacent to the River Lym, Lyme is mentioned in the Domesday Book of 1086. In the 13th century, it developed as one of the major British ports, a Royal Charter was granted by King Edward I in 1284 when Regis was added to the towns name. The charter was confirmed by Queen Elizabeth I in 1591, John Leland visited the town in the 16th century and described it as a praty market town set in the rootes of an high rokky hille down to the hard shore. There cummith a shalow broke from the hilles about a three miles by north, and cummith fleting on great stones through a bridge in the botom. In 1644, during the English Civil War, Parliamentarians withstood a siege of the town by Royalist forces under Prince Maurice. The Duke of Monmouth landed at Lyme Regis at start of the Monmouth Rebellion in 1685, on New Years Day,1915, the H. M. S. Formidable was torpedoed, the first major U-boat loss of World War I, a local lifeboat delivered bodies to the Pilot Boat Inn on Bridge Street. Lassie, the dog of the Inns owner, licked the face of Seaman Cowan, believed dead, the namesake of the cross-breed became a legend of books, radio, film and television. In 1965, the railway station was closed, in the Beeching Axe. The station was dismantled and rebuilt at Alresford, on the Mid Hants Watercress Railway in Hampshire, the route to Lyme Regis was notable for being operated by aged Victorian locomotives. One of these Adams Radial Tank engines is now preserved on the Bluebell Railway in Sussex, West Country Class steam locomotive No.34009 was named Lyme Regis after the town. In 2005, as part of the bicentenary of Admiral Nelsons victory at the Battle of Trafalgar, the actor playing the part of Trafalgar messenger Lieutenant Lapenotiere was welcomed at Lyme Regis
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Mudrock
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Mudrocks are a class of fine grained siliciclastic sedimentary rocks. The varying types of mudrocks include, siltstone, claystone, mudstone, slate, most of the particles of which the stone is composed are less than 0.0625 mm and are too small to study readily in the field. At first sight the rock types look quite similar, however, there are important differences in composition, there has been a great deal of disagreement involving the classification of mudrocks. Fine sediment is the most abundant product of erosion, and these contribute to the overall omnipresence of mudrocks. With increased pressure over time the platey clay minerals may become aligned and this finely bedded material that splits readily into thin layers is called shale, as distinct from mudstone. The lack of fissility or layering in mudstone may be due either to the texture or to the disruption of layering by burrowing organisms in the sediment prior to lithification. From the beginning of civilization, when pottery and mudbricks were made by hand, to now, literature on this omnipresent rock-type has been increasing in recent years, and technology continues to allow for better analysis. Mudrocks, by definition, consist of at least fifty percent mud-sized particles, specifically, mud is composed of silt-sized particles that are between 1/16 – 1/256 of a millimeter in diameter, and clay-sized particles which are less than 1/256 millimeter. Mudrocks contain mostly clay minerals, and quartz and feldspars and they can also contain the following particles at less than 63 micrometres, calcite, dolomite, siderite, pyrite, marcasite, heavy minerals, and even organic carbon. There are various synonyms for fine-grained siliciclastic rocks containing fifty percent or more of its constituents less than 1/256 of a millimeter. Mudstones, shales, lutites, and argillites are common qualifiers, or umbrella-terms, however, the term mudrock allows for further subdivisions of siltstone, claystone, mudstone, and shale. For example, a siltstone would be made of more than 50-percent grains that equate to 1/16 - 1/256 of a millimeter, Shale denotes fissility, which implies an ability to part easily or break parallel to stratification. Siltstone, mudstone, and claystone implies lithified, or hardened, a claystone is lithified, and non-fissile mudrock. In order for a rock to be considered a claystone, it must consist of up to fifty percent clay, clay minerals are integral to mudrocks, and represent the first or second most abundant constituent by volume. There are 35 recognized clay mineral species on Earth and they make muds cohesive and plastic, or able to flow. Clay is by far the smallest particles recognized in mudrocks, most materials in nature are clay minerals, but quartz, feldspar, iron oxides, and carbonates can weather to sizes of a typical clay mineral. For a size comparison, a particle is 1/1000 the size of a sand grain. This means a particle will travel 1000 times further at constant water velocity
3.
Clay
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Clay is a fine-grained natural rock or soil material that combines one or more clay minerals with traces of metal oxides and organic matter. Geologic clay deposits are composed of phyllosilicate minerals containing variable amounts of water trapped in the mineral structure. Clays are plastic due to water content and become hard, brittle. Depending on the content in which it is found, clay can appear in various colours from white to dull grey or brown to deep orange-red. Although many naturally occurring deposits include both silts and clay, clays are distinguished from other fine-grained soils by differences in size, silts, which are fine-grained soils that do not include clay minerals, tend to have larger particle sizes than clays. There is, however, some overlap in size and other physical properties. The distinction between silt and clay varies by discipline, geologists and soil scientists usually consider the separation to occur at a particle size of 2 µm, sedimentologists often use 4–5 μm, and colloid chemists use 1 μm. Geotechnical engineers distinguish between silts and clays based on the plasticity properties of the soil, as measured by the soils Atterberg limits, ISO14688 grades clay particles as being smaller than 2 μm and silt particles as being larger. These solvents, usually acidic, migrate through the rock after leaching through upper weathered layers. In addition to the process, some clay minerals are formed through hydrothermal activity. There are two types of deposits, primary and secondary. Primary clays form as residual deposits in soil and remain at the site of formation, secondary clays are clays that have been transported from their original location by water erosion and deposited in a new sedimentary deposit. Clay deposits are associated with very low energy depositional environments such as large lakes. Depending on the source, there are three or four main groups of clays, kaolinite, montmorillonite-smectite, illite, and chlorite. Chlorites are not always considered to be a clay, sometimes being classified as a group within the phyllosilicates. There are approximately 30 different types of clays in these categories. Varve is clay with visible annual layers, which are formed by deposition of those layers and are marked by differences in erosion. This type of deposit is common in glacial lakes
4.
Shale
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Shale is a fine-grained, clastic sedimentary rock composed of mud that is a mix of flakes of clay minerals and tiny fragments of other minerals, especially quartz and calcite. The ratio of clay to other minerals is variable, shale is characterized by breaks along thin laminae or parallel layering or bedding less than one centimeter in thickness, called fissility. Mudstones, on the hand, are similar in composition. Before the mid 19th century, the slate, shale. In the context of underground mining, shale was frequently referred to as slate well into the 20th century. Non-fissile rocks of similar composition but made of smaller than 0.06 mm are described as mudstones or claystone. Rocks with similar sizes but with less clay and therefore grittier are siltstones. Shale is the most common sedimentary rock, shales are typically composed of variable amounts of clay minerals and quartz grains and the typical color is gray. Addition of variable amounts of minor constituents alters the color of the rock, black shale results from the presence of greater than one percent carbonaceous material and indicates a reducing environment. Black shale can also be referred to as black metal, red, brown and green colors are indicative of ferric oxide, iron hydroxide, or micaceous minerals. Clays are the constituent of shales and other mudrocks. The clay minerals represented are largely kaolinite, montmorillonite and illite, clay minerals of Late Tertiary mudstones are expandable smectites whereas in older rocks especially in mid- to early Paleozoic shales illites predominate. The transformation of smectite to illite produces silica, sodium, calcium, magnesium, iron and these released elements form authigenic quartz, chert, calcite, dolomite, ankerite, hematite and albite, all trace to minor minerals found in shales and other mudrocks. Shales and mudrocks contain roughly 95 percent of the matter in all sedimentary rocks. However, this amounts to less than one percent by mass in an average shale, black shales, which form in anoxic conditions, contain reduced free carbon along with ferrous iron and sulfur. Pyrite and amorphous iron sulfide along with carbon produce the black coloration, the process in the rock cycle which forms shale is called compaction. The fine particles that compose shale can remain suspended in long after the larger particles of sand have deposited. Shales are typically deposited in very slow moving water and are found in lakes and lagoonal deposits, in river deltas, on floodplains
5.
Dunham classification
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Robert J. Dunham published his classification system for limestone in 1962. His scheme focuses on the fabric of carbonate rocks. Dunham divides the rocks into four groups based on relative proportions of coarser clastic particles. Dunham names are essentially for rock families, unlike the Folk classification scheme, Dunham deals with the original porosity of the rock. The Dunham scheme is useful for hand samples because it is based on texture. The classification is a way of describing the composition of rocks in hand sample. Mudstone contains less than 10% grains, supported by a lime mud, wackestone consists of more than 10% grains, supported by a lime mud. Packstone contains lime mud and is grain supported, grainstone lacks mud and is grain supported. Bafflestone develops where organisms have hindered deposition, reducing the local depositional energy and these stones usually contain traces of the baffling organisms, and smaller grains than would be expected from the strength of the paleocurrent. Bindstone is produced where organisms encrust the elements during deposition and bind them together, framestone is a solid calcareous or siliceous framework which is maintained by an organism such as a coral or sponge. Crystalline carbonate does not have recognisable depositional structures, classification of carbonate rocks according to depositional texture. American Association of Petroleum Geologists Memoir
6.
Limestone
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Limestone is a sedimentary rock, composed mainly of skeletal fragments of marine organisms such as coral, forams and molluscs. Its major materials are the minerals calcite and aragonite, which are different crystal forms of calcium carbonate, about 10% of sedimentary rocks are limestones. The solubility of limestone in water and weak acid solutions leads to karst landscapes, most cave systems are through limestone bedrock. The first geologist to distinguish limestone from dolomite was Belsazar Hacquet in 1778, like most other sedimentary rocks, most limestone is composed of grains. Most grains in limestone are skeletal fragments of organisms such as coral or foraminifera. Other carbonate grains comprising limestones are ooids, peloids, intraclasts and these organisms secrete shells made of aragonite or calcite, and leave these shells behind when they die. Limestone often contains variable amounts of silica in the form of chert or siliceous skeletal fragment, some limestones do not consist of grains at all, and are formed completely by the chemical precipitation of calcite or aragonite, i. e. travertine. Secondary calcite may be deposited by supersaturated meteoric waters and this produces speleothems, such as stalagmites and stalactites. Another form taken by calcite is oolitic limestone, which can be recognized by its granular appearance, the primary source of the calcite in limestone is most commonly marine organisms. Some of these organisms can construct mounds of rock known as reefs, below about 3,000 meters, water pressure and temperature conditions cause the dissolution of calcite to increase nonlinearly, so limestone typically does not form in deeper waters. Limestones may also form in lacustrine and evaporite depositional environments, calcite can be dissolved or precipitated by groundwater, depending on several factors, including the water temperature, pH, and dissolved ion concentrations. Calcite exhibits a characteristic called retrograde solubility, in which it becomes less soluble in water as the temperature increases. Impurities will cause limestones to exhibit different colors, especially with weathered surfaces, Limestone may be crystalline, clastic, granular, or massive, depending on the method of formation. Crystals of calcite, quartz, dolomite or barite may line small cavities in the rock, when conditions are right for precipitation, calcite forms mineral coatings that cement the existing rock grains together, or it can fill fractures. Travertine is a banded, compact variety of limestone formed along streams, particularly there are waterfalls. Calcium carbonate is deposited where evaporation of the leaves a solution supersaturated with the chemical constituents of calcite. Tufa, a porous or cellular variety of travertine, is found near waterfalls, coquina is a poorly consolidated limestone composed of pieces of coral or shells. During regional metamorphism that occurs during the building process, limestone recrystallizes into marble
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Mars
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Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System, after Mercury. Named after the Roman god of war, it is referred to as the Red Planet because the iron oxide prevalent on its surface gives it a reddish appearance. Mars is a planet with a thin atmosphere, having surface features reminiscent both of the impact craters of the Moon and the valleys, deserts, and polar ice caps of Earth. The rotational period and seasonal cycles of Mars are likewise similar to those of Earth, Mars is the site of Olympus Mons, the largest volcano and second-highest known mountain in the Solar System, and of Valles Marineris, one of the largest canyons in the Solar System. The smooth Borealis basin in the northern hemisphere covers 40% of the planet, Mars has two moons, Phobos and Deimos, which are small and irregularly shaped. These may be captured asteroids, similar to 5261 Eureka, a Mars trojan, there are ongoing investigations assessing the past habitability potential of Mars, as well as the possibility of extant life. Future astrobiology missions are planned, including the Mars 2020 and ExoMars rovers, liquid water cannot exist on the surface of Mars due to low atmospheric pressure, which is about 6⁄1000 that of the Earths, except at the lowest elevations for short periods. The two polar ice caps appear to be largely of water. The volume of ice in the south polar ice cap, if melted. On November 22,2016, NASA reported finding a large amount of ice in the Utopia Planitia region of Mars. The volume of water detected has been estimated to be equivalent to the volume of water in Lake Superior, Mars can easily be seen from Earth with the naked eye, as can its reddish coloring. Its apparent magnitude reaches −2.91, which is surpassed only by Jupiter, Venus, the Moon, optical ground-based telescopes are typically limited to resolving features about 300 kilometers across when Earth and Mars are closest because of Earths atmosphere. Mars is approximately half the diameter of Earth with an area only slightly less than the total area of Earths dry land. Mars is less dense than Earth, having about 15% of Earths volume and 11% of Earths mass, the red-orange appearance of the Martian surface is caused by iron oxide, or rust. It can look like butterscotch, other common colors include golden, brown, tan. Like Earth, Mars has differentiated into a metallic core overlaid by less dense materials. Current models of its interior imply a core with a radius of about 1,794 ±65 kilometers, consisting primarily of iron and this iron sulfide core is thought to be twice as rich in lighter elements than Earths. The core is surrounded by a mantle that formed many of the tectonic and volcanic features on the planet
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CheMin
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CheMin, short for Chemistry and Mineralogy, is an instrument located in the interior of the Curiosity rover that is exploring the surface of Gale crater on Mars. David Blake, from NASA Ames Research Center, is the Principal Investigator, CheMin identifies and quantifies the minerals present in rocks and soil delivered to it by the rovers robotic arm. By determining the mineralogy in rocks and soils, CheMin assesses the involvement of water in their formation, deposition, in addition, CheMin data is useful in the search for potential mineral biosignatures, energy sources for life or indicators for past habitable environments. CheMin aboard the Curiosity rover on Mars won the 2013 NASA Government Invention of the year award, CheMin is an X-ray powder diffraction instrument that also has X-ray fluorescence capabilities. Raw CCD frames are processed into data products on board the rover to reduce the data volume and these data products are transmitted to Earth for further processing analyses. In operation, a collimated X-ray source produces and directs a beam through a sample cell containing powdered material. An X-ray sensitive CCD imager is positioned on the side of the sample from the source. The CCD can measure the charge generated by each photon, diffracted X-rays strike the detector and are identified by their energy, producing a two-dimensional image that constitutes the diffraction pattern of the sample. Both crystalline and amorphous materials can be analyzed in this fashion, the funnel contains a 1 mm mesh screen to limit the particle size. Five permanent cells are loaded with calibration standards, these are single minerals or synthetic ceramic, each analysis may take up to 10 hours, spread out over two or more Martian nights. Capacity, CheMin is planned to analyze as many as 74 dry samples, cross-contamination by cell reuse is expected to be less than 5%. CheMin does not have the capability to store previously analyzed samples for later reanalysis, detection limits, able to detect individual minerals that are present at the 3% level and above. The paragonetic tephra from a Hawaiian cinder cone has been mined to create Martian regolith simulant for researchers to use since 1998
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NASA
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President Dwight D. Eisenhower established NASA in 1958 with a distinctly civilian orientation encouraging peaceful applications in space science. The National Aeronautics and Space Act was passed on July 29,1958, disestablishing NASAs predecessor, the new agency became operational on October 1,1958. Since that time, most US space exploration efforts have led by NASA, including the Apollo Moon landing missions, the Skylab space station. Currently, NASA is supporting the International Space Station and is overseeing the development of the Orion Multi-Purpose Crew Vehicle, the agency is also responsible for the Launch Services Program which provides oversight of launch operations and countdown management for unmanned NASA launches. NASA shares data with various national and international such as from the Greenhouse Gases Observing Satellite. Since 2011, NASA has been criticized for low cost efficiency, from 1946, the National Advisory Committee for Aeronautics had been experimenting with rocket planes such as the supersonic Bell X-1. In the early 1950s, there was challenge to launch a satellite for the International Geophysical Year. An effort for this was the American Project Vanguard, after the Soviet launch of the worlds first artificial satellite on October 4,1957, the attention of the United States turned toward its own fledgling space efforts. This led to an agreement that a new federal agency based on NACA was needed to conduct all non-military activity in space. The Advanced Research Projects Agency was created in February 1958 to develop technology for military application. On July 29,1958, Eisenhower signed the National Aeronautics and Space Act, a NASA seal was approved by President Eisenhower in 1959. Elements of the Army Ballistic Missile Agency and the United States Naval Research Laboratory were incorporated into NASA, earlier research efforts within the US Air Force and many of ARPAs early space programs were also transferred to NASA. In December 1958, NASA gained control of the Jet Propulsion Laboratory, NASA has conducted many manned and unmanned spaceflight programs throughout its history. Some missions include both manned and unmanned aspects, such as the Galileo probe, which was deployed by astronauts in Earth orbit before being sent unmanned to Jupiter, the experimental rocket-powered aircraft programs started by NACA were extended by NASA as support for manned spaceflight. This was followed by a space capsule program, and in turn by a two-man capsule program. This goal was met in 1969 by the Apollo program, however, reduction of the perceived threat and changing political priorities almost immediately caused the termination of most of these plans. NASA turned its attention to an Apollo-derived temporary space laboratory, to date, NASA has launched a total of 166 manned space missions on rockets, and thirteen X-15 rocket flights above the USAF definition of spaceflight altitude,260,000 feet. The X-15 was an NACA experimental rocket-powered hypersonic research aircraft, developed in conjunction with the US Air Force, the design featured a slender fuselage with fairings along the side containing fuel and early computerized control systems
10.
Planetary habitability
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Planetary habitability is the measure of a planets or a natural satellites potential to have habitable environments hospitable to life. Habitable environments do not need to contain life, Life may develop directly on a planet or satellite or be transferred to it from another body, a hypothetical process known as panspermia. Research and theory in this regard is a component of planetary science, in determining the habitability potential of a body, studies focus on its bulk composition, orbital properties, atmosphere, and potential chemical interactions. Stellar characteristics of importance include mass and luminosity, stable variability, the idea that planets beyond Earth might host life is an ancient one, though historically it was framed by philosophy as much as physical science. The late 20th century saw two breakthroughs in the field, the discovery of extrasolar planets, beginning in the early 1990s and accelerating thereafter, has provided further information for the study of possible extraterrestrial life. These findings confirm that the Sun is not unique among stars in hosting planets, the chemistry of life may have begun shortly after the Big Bang,13.8 billion years ago, during a habitable epoch when the Universe was only 10–17 million years old. According to the hypothesis, microscopic life—distributed by meteoroids, asteroids. Nonetheless, Earth is the place in the Universe known to harbor life. 11 billion of these planets may be orbiting Sun-like stars. The nearest such planet may be 12 light-years away, according to the scientists, an understanding of planetary habitability begins with the host star. Under the auspices of SETIs Project Phoenix, scientists Margaret Turnbull and Jill Tarter developed the HabCat in 2002. According to research published in August 2015, very large galaxies may be favorable to the formation and development of habitable planets than smaller galaxies. The spectral class of a star indicates its photospheric temperature, which correlates to overall mass, the appropriate spectral range for HabStars is considered to be late F or G, to mid-K. This corresponds to temperatures of a more than 7,000 K down to a little more than 4,000 K, the Sun. This spectral range probably accounts for between 5% and 10% of stars in the local Milky Way galaxy, middle-class stars of this sort have a number of characteristics considered important to planetary habitability, They live at least a few billion years, allowing life a chance to evolve. More luminous main-sequence stars of the O, B, and A classes usually live less than a billion years and they emit enough high-frequency ultraviolet radiation to trigger important atmospheric dynamics such as ozone formation, but not so much that ionisation destroys incipient life. Liquid water may exist on the surface of planets orbiting them at a distance that does not induce tidal locking, k-type stars may be able to support life far longer than the Sun. Gliese 581 c, a super-Earth, has been found orbiting in the zone of a red dwarf
11.
Curiosity (rover)
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Curiosity is a car-sized robotic rover exploring Gale Crater on Mars as part of NASAs Mars Science Laboratory mission. Curiosity was launched from Cape Canaveral on November 26,2011, at 15,02 UTC aboard the MSL spacecraft, the Bradbury Landing site was less than 2.4 km from the center of the rovers touchdown target after a 560 million km journey. Curiositys design will serve as the basis for the planned Mars 2020 rover, in December 2012, Curiositys two-year mission was extended indefinitely. As of April 7,2017, Curiosity has been on Mars for 1659 sols since landing on August 6,2012, the mission will also help prepare for human exploration. This data would be important for a manned mission. The remaining mass of the MSL craft was discarded in the process of carrying out this task, dimensions, Curiosity has a mass of 899 kg including 80 kg of scientific instruments. The rover is 2.9 m long by 2.7 m wide by 2.2 m in height, power source, Curiosity is powered by a radioisotope thermoelectric generator, like the successful Viking 1 and Viking 2 Mars landers in 1976. Radioisotope power systems are generators that produce electricity from the decay of isotopes, such as plutonium-238. Heat given off by the decay of this isotope is converted into electric voltage by thermocouples, providing constant power during all seasons and through the day, waste heat can be used via pipes to warm systems, freeing electrical power for the operation of the vehicle and instruments. Curiositys RTG is fueled by 4.8 kg of plutonium-238 dioxide supplied by the U. S. Department of Energy. The MMRTG produces less power over time as its plutonium fuel decays, at its minimum lifetime of 14 years, electrical power output is down to 100 watts. The power source will generate 9 MJ each day, much more than the solar panels of the Mars Exploration Rovers, the electrical output from the MMRTG charges two rechargeable lithium-ion batteries. This enables the power subsystem to meet power demands of rover activities when the demand temporarily exceeds the generator’s steady output level. Each battery has a capacity of about 42 ampere-hours, heat rejection system, The temperatures at the landing site can vary from −127 to 40 °C, therefore, the thermal system will warm the rover for most of the Martian year. It uses fluid pumped through 60 m of tubing in the body so that sensitive components are kept at optimal temperatures. The HRS also has the ability to cool components if necessary, the computers run the VxWorks real-time operating system. Each computers memory includes 256 kB of EEPROM,256 MB of DRAM, for comparison, the Mars Exploration Rovers used 3 MB of EEPROM,128 MB of DRAM, and 256 MB of flash memory. The RCE computers use the RAD750 CPU, which is a successor to the RAD6000 CPU of the Mars Exploration Rovers
