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6/3/2023 0 Comments Gravity guy not doppler![]() ![]() Tharsis is a volcanic plateau on Mars thousands of miles across with the largest volcanoes in the solar system. The new gravity map shows that some of these features run perpendicular to the local topography slope, against what would have been the natural downhill flow of water.Īn alternative explanation is that this anomaly may be a consequence of a flexure or bending of the lithosphere - the strong, outermost layer of the planet - due to the formation of the Tharsis region. This system of gravity troughs is unlikely to be only due to buried channels because in places the region is elevated above the surrounding plains. The new map reveals that this low gravity anomaly is definitely larger and follows the boundary between the highlands and the lowlands. "The better resolution of the new map helps interpret how the crust of the planet changed over Mars' history in many regions."įor example, an area of lower gravity between Acidalia Planitia and Tempe Terra was interpreted before as a system of buried channels that delivered water and sediments from Mars' southern highlands into the northern lowlands billions of years ago when the Martian climate was wetter than it is today. "With this new map, we've been able to see gravity anomalies as small as about 62 miles (100 kilometers) across, and we've determined the crustal thickness of Mars with a resolution of almost 75 miles (around 120 kilometers)," said Genova. It took two years of analysis and computer modeling to remove the motion not caused by gravity. ![]() However, orbital changes from uneven gravity are tiny, and other forces that can perturb the motion of the spacecraft had to be carefully accounted for, such as the force of sunlight on the spacecraft's solar panels and drag from the Red Planet's thin upper atmosphere. The gravity field was recovered using about 16 years of data that were continuously collected in orbit around Mars. These small fluctuations in the orbital data were used to build a map of the Martian gravity field. Slight differences in Mars' gravity changed the trajectory of the NASA spacecraft orbiting the planet, which altered the signal being sent from the spacecraft to the Deep Space Network. For example, the pull will be a bit stronger over a mountain, and slightly weaker over a canyon. Like all planets, Mars is lumpy, which causes the gravitational pull felt by spacecraft in orbit around it to change. The map was derived using Doppler and range tracking data collected by NASA's Deep Space Network from three NASA spacecraft in orbit around Mars: Mars Global Surveyor (MGS), Mars Odyssey (ODY), and the Mars Reconnaissance Orbiter (MRO). They also observed how that mass moves between the south pole and the north pole with the change of season in each hemisphere. ![]() Finally, by observing how Mars' gravity changed over 11 years - the period of an entire cycle of solar activity - the team inferred the massive amount of carbon dioxide that freezes out of the atmosphere onto a Martian polar ice cap when it experiences winter. Also, the team confirmed that Mars has a liquid outer core of molten rock by analyzing tides in the Martian crust and mantle caused by the gravitational pull of the sun and the two moons of Mars. The improved resolution of the new gravity map suggests a new explanation for how some features formed across the boundary that divides the relatively smooth northern lowlands from heavily cratered southern highlands. ![]() 6/3/2023 0 Comments Gorilla skull![]() In the summer, this is usually done in the yard. Food items are cut up and spread over a wide area. Females eat about two-thirds of that amount.Īt the Smithsonian's National Zoo, the group is fed together in the morning. Adult male gorillas eat about 45 pounds (32 kilograms) of food per day. Gorillas get some protein from invertebrates found on leaves and fruits. Other gorilla subspecies eat proportionally less fruit. They also eat the fleshy fruits of close to a hundred seasonally fruiting tree species. Gorillas are primarily herbivorous, eating the leaves and stems of herbs, shrubs and vines. Like other primates, each individual has distinctive fingerprints. Gorillas' arms are longer than their legs when they move on all fours, they knuckle-walk, supporting their weight on the third and fourth digits of their curled hands. In comparison to the mountain gorilla, the western lowland gorilla has a wider and larger skull, and their big toe is spread apart more from the alignment of the other four toes. Adult female gorillas also have these crests, but they are much less pronounced. These crests anchor the massive muscles used to support and operate their large jaws and teeth. They also have a differently shaped nose and lip than other subspecies.Īdult male gorillas' heads look conical due to the large bony crests on the top and back of the skull. Compared to other subspecies, western lowland gorillas have a more pronounced brow ridge and ears that appear small in relation to their heads. Western lowland females may go gray below the ears and on the neck and top of the head as they age. In western lowland gorillas, the silver may extend to rump and thighs. Mature silverback males have a saddle of white hair across the small of their backs. The white patch helps the mother keep track of the infant and assists other group members in identifying the gorilla as an infant. A small white tuft of hair on their rump distinguishes infants up to four years old. Western lowland gorillas may have a more brownish coloration. ![]() Short, thin, gray-black to brown-black hair covers the entire body except the face. ![]() 6/3/2023 0 Comments Tormented souls anna![]() Mother is dead drunk and father is absent (‘Lullaby’). There seems to be no hope in the celebrated peace and security of the home. However, this results in the destruction of both bodies (‘Pyro’s Ode to Prufrock’). One would have thought that developing passionate relationships would provide an escape route. Faced with a crisis of hopelessness, the mind seeks (temporary?) refuge in drinking (‘A Full Glass’). Zimbabwe’s implosion at the national level has led to soul-searching at the individual level. In ‘Midlife Crisis’, Sasa expresses this sense of unrest, where time dissolves into the past, and the mind grapples with uncertainty and despair. Pain and confusion settle on the individual’s mind as hope is lost and the perception of crisis becomes a foreboding. But the sense of failure and disillusionment is not confined to a national level it is reflected deeply at a personal and family level, and the national crisis manifests in unfulfilled personal hope, dream and memory. ![]() The tragedy is both its downfall and the promise that it once held for its people. ![]() Given the derivation of Zimbabwe from ‘Dzimbabwe’, meaning, literally, “houses of stone”, it is clear that the poet is mourning the destruction of her country. The reader is left to feel the devastation through her vivid descriptions, “I walk through the ruins/of what once was a mighty fortress/ of stone.” (‘Myths and Legends’). With acute insight, the poet describes Zimbabwe’s fall from grace. There are no sacred cows and every effort is made to lay bare Zimbabwe’s paralysis. “Graveyards overflow, our country is in crisis ![]() ![]()
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