Wednesday, November 27, 2019

The Grand Canyon free essay sample

The Grand Canyon National Park contains one of the most well known natural wonders of our country: The Grand Canyon. It is located in Arizona. Over the years, the Grand Canyon has attracted many visitors, and today the park sees nearly five million visitors yearly (NPS, History Culture). It has always been a target for human interest, going back to the days where Native Americans ruled the land and continuing through present times. However, like the rest of our natural world, the Grand Canyon faces many threats, mainly due to humans. What are these things that threaten the Grand Canyon, what is being done to combat them, and what else can be done to protect the Grand Canyon National Park? Within the Grand Canyon lays the Colorado River, which scientists believe carved it out 17 million years ago, much earlier than the previous estimate of 6 million years (Wilford). The river consumes the area over time, eventually forming the magnificent canyon that we see today. We will write a custom essay sample on The Grand Canyon or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page The canyon runs east-west so it has a North Rim and a South Rim. The Grand Canyon is 277 miles long, 18 miles wide and 5,000 feet deep (Grand Canyon Facts). It contains several ecosystems and hundreds of unique species of animals and over a thousand species of plants (Grand Canyon Facts). The Grand Canyon contains very old objects that date from up to 12,000 years ago (NPS, History Culture), back to early Native American culture. Therefore, it has been known to, used by, and been occupied by humans for a very long time. According to the U. S. National Park Service, â€Å"the park has recorded over 4,800 archeological resources with an intensive survey of nearly Le 2 3% of the park area† (NPS, History Culture). The Grand Canyon was first given federal protection in 1893, but it wasn’t for nearly another 30 years that it would become a National Park. This happened in 1913, three years after the National Park Service was created (NPS, History Culture). The Grand Canyon is thus one of the oldest national parks in the country. Before it became a national park and a magnet for tourism, the Grand Canyon attracted explorers, pioneers, and corporations looking to harness resources from it. Being a national, the Grand Canyon has always been a target of conservation. The first such effort was started by Franklin D. Roosevelt, who in 1933 put people to work who were jobless due to the Great Depression (NPS, CCC). He created the Civilian Conservation Corps (CCC) and filled it using poor and unemployed men. It lasted for nine years, and during its time they traveled around the country completing conservation projects at national parks and other sites. They engaged in projects such as â€Å"tree planting, trail construction, erosion control, forest fire fighting, state park development, and fire road construction† (NPS, CCC). According to the National Park Service, four federal agencies were used to make sure that the CCC was successful. The Department of Labor selected the workers, The Department of War transported, supervised, and managed their care, and the Departments of Agriculture and Interior designed the projects and supervised the Corps. What types of threats does the Grand Canyon face today? Well, there are many in fact. Due to pollution, building, and other human activities, nature is Le 3 often thrown out of balance, and without further human intervention to reverse these problems, natural habitats are threatened. According to a report by the National Parks Conservation Association, one challenge is â€Å"Colorado River management actions that do not incorporate adaptive strategies for protecting and restoring fish, river flows, riverine habitats, cultural sites, and archaeological resources along the river corridor† NPCA, 3). Other problems include sounds cape management, such as over flights that can disturb visitors, wildlife, and the 11 Native American tribes which live in the park (NPCA, 3). Greater and better relationships with these tribes are also wanted. Mining activities from the past and present, along with air pollution from nearby areas also pose threats to the health of the park. Due to environmental change, the canyon even faces threats from non-native animals intruding. According to Anne Minard of the High Country News, drought has recently brought bison into the park. They were originally taken into Arizona for an experiment to breed them with cattle, although that failed (Minard). â€Å"Biologists with the National Park Service say the huge animals (males can weigh up to 2,500 pounds) are wallowing in riparian areas and damaging cultural sites. They considered building a fence, but that would affect other wildlife, such as mule deer† (Minard). The NPCA also states that there are â€Å"front country and backcountry management and protection needs, particularly in regard to the challenges of park size, visitation patterns, and shortfalls in funding, which compromise efforts to preserve and protect the park’s resources. † Finally, the Grand Canyon faces the threat of climate change, like much of the Le 4 rest of the world. The Grand Canyon faces threats to its land, water, resources, wildlife, and even people. What are some things being done to address these problems and what more can be done to do so? The NPCA addresses each problem and makes recommendations. The river must go back to a more natural state, with a reduction in rafting and non-native oceangoing animals. The NPCA also recommends restorative flows to the river. For noise pollution, the park should prohibit flights and certain areas and put a cap on air tours. Mining is one thing that is already been addressed. The report states that â€Å"The Secretary of the Interior has temporarily barred the filing of new mining claims — including those for uranium — on the nearly one million acres of public land surrounding the Grand Canyon. † The NPCA recommends that Congress pass an act to permanently ban mining on these public lands. Since the park has no authority over air pollution from other areas, it must rely on government regulation to cut down on pollution. The park should press the government to continue regulating pollution. In 1991, environmental groups and a nearby Navajo electrical plant agreed to â€Å"drastically cut sulfur-dioxide emissions,† (Air Pollution) but there is still more to be done. As for non-native animals, greater effort must be undertaken to make sure that they are removed and that more are not brought in. When it comes to park management, the park needs more resources and funding to ensure that visitors have a great and safe experience and that all buildings and structures in the park are in good Le 5 condition. For building ties with the Native American tribes, the park should make them more involved and known to visitors, through areas like history, art, and â€Å"cultural significance† (NPCA, 4). When it comes to climate change, this is another thing that is beyond the park’s control, as it is a global event. The whole world must take action against climate change in order for both the Grand Canyon National Park and the Earth itself to be protected. â€Å"Grand Canyon Park Supervisor Steve Martin said he generally agrees with the report’s findings† (O’Keefe). The Grand Canyon Chapter of the Sierra Club, an environmental organization, has been working with the park for years on protecting its environment. The chapter aims to fight against climate change and preserve wildlife. Some of their objectives include stopping mining in the park and the surrounding region, limit off-road vehicle activity in the area, convince Congress to pass the Grand Canyon Watersheds Protection Act, and â€Å"promote resilient habitats† (Sierra Club). In conclusion, there are many things that threaten this grand park, and there are many challenges ahead for preserving the Grand Canyon.

Saturday, November 23, 2019

Yuan Dynasty Emperors List - Chinese Emperors

Yuan Dynasty Emperors List - Chinese Emperors The Yuan Dynasty in China was one of the five khanates of the Mongol Empire, founded by Genghis Khan. It ruled most of the modern day China from 1271 to 1368.  Genghis Khans grandson, Kublai Khan, was the founder and first emperor of the Yuan Dynasty. Each Yuan emperor also served as the Great Khan of the Mongols, meaning that the rulers of the Chagatai Khanate, the Golden Horde, and the Ilkhanate answered to him (at least in theory). Mandate of Heaven According to official Chinese histories, the Yuan Dynasty received the Mandate of Heaven even though it was not ethnically Han Chinese. This was true of several other major dynasties in Chinese history, including the Jin Dynasty (265 - 420 CE) and the Qing Dynasty (1644 - 1912). Although the Mongol rulers of China adopted some Chinese customs, such as the use of the Civil Service Exam system based on the writings of Confucius, the dynasty maintained its distinctly Mongol approach to life and lordship. Yuan emperors and empresses were famous for their love of hunting from horseback, and some of the early Yuan era Mongol lords evicted Chinese peasants from their farms and turned the land into horse pastures. The Yuan emperors, unlike other foreign rulers of China, married and took concubines only from within the Mongol aristocracy. Thus, to the end of the dynasty, the emperors were of pure Mongol heritage. Mongol Rule For almost a century, China flourished under Mongol rule. Trade along the Silk Road, which had been interrupted by warfare and banditry, grew strong once again under the Pax Mongolica. Foreign traders flowed into China, including a man from far-off Venice called Marco Polo, who spent more than two decades in Kublai Khans court. However, Kublai Khan over-extended his military power and the Chinese treasury with his military adventures overseas. Both of his invasions of Japan ended in disaster, and his attempted conquest of Java, now in Indonesia, was equally (although less dramatically) unsuccessful. The Red Turban Rebellion Kublais successors were able to rule in relative peace and prosperity until the end of the 1340s.  At that time, a series of droughts and floods produced famine in the Chinese countryside. People began to suspect that the Mongols had lost the Mandate of Heaven. The Red Turban Rebellion began in 1351, drawing its members from the hungry ranks of the peasantry, and would end up overthrowing the Yuan Dynasty in 1368. The emperors are listed here by their given names and khan names. Although Genghis Khan and several other relatives were posthumously named emperors of the Yuan Dynasty, this list begins with Kublai Khan, who actually defeated the Song Dynasty and established control over greater China. Borjigin Kublai, Kublai Khan, 1260-1294Borjigin Temur, Temur Oljeytu Khan, 1294-1307Borjigin Qayshan, Qayshan Guluk, 1308-1311Borjigin Ayurparibhadra, Ayurparibhadra, 1311-1320Borjigin Suddhipala, Suddhipala Gegeen, 1321-1323Borjigin Yesun-Temur, Yesun-Temur, 1323-1328Borjigin Arigaba, Arigaba, 1328Borjigin Toq-Temur, Jijaghatu Toq-Temur, 1328-1329 and 1329-1332Borjigin Qoshila, Qoshila Qutuqtu, 1329Borjigin Irinchibal, Irinchibal, 1332Borjigin Toghan-Temur, Toghan-Temur, 1333-1370

Thursday, November 21, 2019

Two Psychometric Tests Essay Example | Topics and Well Written Essays - 2750 words

Two Psychometric Tests - Essay Example CPP, the institute from where the test can be officially obtained, claims that it administers over 2 million assessments annually, which is the largest number for any psychometric assessment. The entire framework of MBTI rests on four major dichotomies (Berens, 2001, pp. 85-86). Attitude, the first dichotomy, divides people into Extroverts (E) or Introverts (I). The former prefer more interaction, action and spending time with people, whereas, the latter feel more comfortable while spending time alone, believe in being thought oriented, little but substantial interaction and depth in their limited social interactions (Bayne, 1997, pp. 89-90). The function of â€Å"perceiving† is the second dichotomy that divides into Sensing (S) or Intuition (N). Sensing refers to the approach where people look for concrete evidence, facts and empirical evidence. They prefer data coming from, or verifiable through, the five senses and favour measureable information. On the other hand, intuitive people make more effort to look for hidden meanings, patterns and contexts in the data presented to them. They would show more flexibility and trust of abstract and theoretical concepts, insights, subconscious feelings and others (Myers and Myers, 1980, pp. 55-56). The â€Å"judging† function is the third dichotomy, where a person would be classified as a Thinker (T) or Feeler (F). The judging function is concerned with how an individual is making decisions. Thinkers are more likely to make rational, logical and calculated decisions. They avoid developing an attachment with the variables and entities in order to achieve objectivity and make no comprise on the rules and regulations. Feelers, on the other hand, have the tendency to understand the situation from the inside, evaluate other perspectives, create relationships with the variables and then make a decision in order to create a harmony and balance (John, et al., 2008, p. 160). Lastly, the dichotomy of â€Å"lifestyle† classifies people into having a preference for Judging (J) function for Perceiving (P) function. The former people are more likely to live an organised and settled life. On the other hand, perceivers prefer keeping their decisions and options open (Myers and M yers, 1980, pp. 55-56). Development and Design The father of analytical psychology, Carl Jung, deserves the bulk of the credit for the creation of MBTI. Many of the concepts put forward by MBTI were a part of the Jung’s book Psychological Types published in the year 1921. However, the arrangement and approach was a bit different because Jung believed that everyone is either a â€Å"perceiver† or a â€Å"judger†. The rest of the other dimensions would flow from this division (John, et al., 2008, p. 160). MBTI, in its original form, was developed by a team of Katherine Briggs and Isabel Briggs Myers, the mother daughter team, divides people into sixteen different personality types. According to MBTI, there are four dichotomies, each one having two extremes and any people could be at or near any extreme thus allowing sixteen different personality types, based on different combinations (Bayne, 2004, pp. 99-100). MBTI first appeared in the year 1942 and since then it has been revised several times with different authors and most of these revisions have played an important

Wednesday, November 20, 2019

History - Renassiance Essay Example | Topics and Well Written Essays - 750 words

History - Renassiance - Essay Example Despite Senate sanction, the triumvirate was in realty a military junta and the Senate was completely cut off from power. In the proscription that followed, political rivals, including 300 Senators, were executed and their property seized. Julius Caesar was officially deified, further strengthening Octavian’s position as the divi filius, or son of God. The forces of Brutus and Cassius, Caesar’s assassins, were defeated by Octavian and Antony at Philippi in 42 B.C. This can be viewed as the end of any hope of resurrecting the Roman Republic. The final blow against the forces of the old Republic was struck when Octavian’s general, Agrippa, defeated Sextus Pompeius in 36 B.C. at the Battle of Naulochus. Octavian used Antony’s Egyptian connection with Cleopatra to manipulate Roman public opinion against him, culminating in Antony’s defeat at Actium in 31 B.C. Octavian shrewdly adopted the role of defender of the Republic. He brilliantly portrayed Actium as a triumph for the Senate and the Republic, rather than his defeat of a hated rival. He was now in absolute control of Rome. Octavian maintained the elaborate fiction of restoring the Roman Republic by retaining the traditional practices such as consuls, senate and tribunes. By remaining Consul from 31 – 23 B.C., holding the tribunician authority and controlling all the important provinces, Octavian firmly kept the reins of power in his own hands. At the same time, he avoided all external trappings of dictatorship or monarchy. He announced the end of the civil wars with the Pax Romana, executed an ambitious building program and strengthened the economy. In 27 B.C. Octavian brilliantly orchestrated the First Settlement, under which he apparently surrendered his powers to the Senate and was ‘persuaded’ to take them back! He was bestowed the title of ‘Augustus,’ or revered, but claimed to be content to

Sunday, November 17, 2019

Curriculum Development Essay Example for Free

Curriculum Development Essay In the early 20th century, there was a stable increase in high school enrolment and graduation rates. This is because of the second industrial revolution which led to an increased demand for white collar jobs. It is important to understand that the aims of secondary have the societal needs as their point of departure. The societal social, economic, political and even religious needs have hitherto determined the content. However, sometimes it is possible that the two i. e. high school education goals and societal needs may be out of touch thus making the education boring irrelevant and boring. This paper seeks to highlight how American high school viewed as irrelevant can be rearranged to fit the needs of a rapidly emerging high-tech society in the United States. The paper also dwells on a model development of a flexible one-block schedule for a medium sized high school that will include provisions for both departmentalization and team instruction can be. It finally compares the issues and problems in the high school education in the past 50 years with the present ones. The emerging American society has become high tech and calls for a high degree of specialization in any field that an individual deals with. Americans need experts in all fields. Based on the premise that there is need for experts in the job market, the products of high school education are found to be less prepared for this kind of demand. In the American education, there is no specialization until the sophomore year in college. Therefore, there is a pressing need to embrace specialization in the early years in high school to make the students better prepared for the job market. Another issue of concern is the fact that American students have full control of their education in that they choose even the core classes. The curriculum drafters have the responsibility of ensuring that the languages, science and mathematics be compulsory because the respective skills of communication, critical reasoning and evaluation are necessary in the job market. Consider a model one block schedule for a medium sized high school. The model emphasizes the core or compulsory classes that each student must take. These core classes can be taken together in large classes by one teacher but when it comes to the electives, and then the classes need to be at the departmental level. The departments need to develop there own timetables in consideration of the core classes timetable and a curricula tailored to be in tune with the job market specifications. The core classes need ton run everyday. A student is supposed to belong to at least one department and at most three. These are the departments that will help the students specialize in the field of his/her fancy. Before a student t joins any department, there is need for him to clearly describe his career to the careers master at the department so as to determine how what is offered at the department can fit the student’s career goals. The career master is then supposed to advice the student to either join that department or refer him to another one which will fit student’s specifications. This model schedule emphasizes the concept of early specialization as a way of preparing the student for the job market. A number of issues have bedevilled secondary or high school education. The major one being lack of security in the school. The recent shootings by students with guns in schools serve to illustrate this rather unfortunate issue. These shootings underscore the very responsibilities of the school officials of ensuring that students, teachers and other workers are safe while at school. Another issue is the completion rates of high schools which have stagnated for the last 30 years. If progress exists, there is need for the completion rates to be seen increasing. A major issue in education in American high schools is the lack of a nationalized curriculum. Every state has its own specifications and this has in the past attracted cries for the nationalization of education so as to establish national standards that should be adhered by all states. The above issues are either a recurrence of last 50 years or new altogether. Fifty years ago, there was high security in the schools, the completion rate increased especially during the second industrial revolution due to the high demand for skilled manpower. For the case of the nationalization of secondary education, this has been an issue from time immemorial. Each state has been giving its own curriculum with a few resemblances here and there.

Friday, November 15, 2019

Enhancing Quality of Palmyrah (Borrasus Flabellifer) Jaggery

Enhancing Quality of Palmyrah (Borrasus Flabellifer) Jaggery STANDARDIZE AND ENHANCE THE QUALITY OF PALMYRAHÂ  (Borrasus Flabellifer) JAGGERY S. Mary, K. Velauthamurty, S. Srivijeindran, G.Sashikesh Palmyrah (borrasus flabellifer) Jaggery is one of the ancient sweetening agent known to man and is an integral part of traditional diet in many parts of Sri Lanka. Jaggery is produced by concentrating the Inflorescence sap of Palmyrah palm (Sweet Toddy) to a thick consistency. The product has sweet in taste and golden yellow in colour. However existing jaggery available in the market is inferior in its quality as liquefaction and deterioration of color. It shows poor keeping qualities due to the presence of moisture. Through this research attention to be made to eradicate its hydroscopic nature in the existing jaggery to upgrade it. Optimization of quick lime (CaO) and pH of sweet toddy to produce jaggery are to be carried out. In the period of May to June different areas in Jaffna peninsula four field trials were carried out to collect sap by using quick lime with above 95% purity produced at Palmyrah Research Institute. Physical and chemical quality characteristics of produced jagg ery in laboratory and commercial samples were studied according to comply with Sri Lankan standards for jaggery. Quality of jaggery was enhanced using proper technology and sweet sap with acceptable lime with higher degree of purity. For suitable jaggery production, 2.508 Â ± 0.411 grams of lime (96 % purity) per one liter of sweet sap was optimized and this jaggery was scored high score than jaggery from other field trials. Key words: Palmyrah (Borrasus flabellifer) Jaggery, quick lime and sweet sap Introduction Jaggery industry is one of the ancient and large cottage industries in palmyrah society. The product normally made in household level has bitter taste due to the presence of excess amount of lime with low purity. As sugars are known to be hygroscopic it is possible for melting of jaggery (Molasses) due to presence of excess moisture in the environment and other moisture absorbing impurities from quick lime and triple super phosphate for deliming the quick lime and minor improper practices in processing. Even if the demand for jaggery according to their food based applications is continuously growing in the rural, urban and semi-urban markets palmyrah jaggery cannot be marketed whole of the year, means up to next season. Because sweet toddy production is seasonal and produced jaggery shows poor keeping qualities. Quick lime used in the preparation of jaggery is generally obtained from furnacing oysters (mostly sea shell in Jaffna) using coconut husk charcoal and the temperature is not up to the optimum level to produce pure lime. Therefore there is a high possible for adulteration by impurities presence in quick lime. Traditionally lime used to prevent the fermentation of sweet sap, is produced mainly from sea shell and hardly from oysters. But no studies were yet carried out on the composition and purity of quick lime used in local production. Another major issue is the local tappers are using excess amount lime which present in sweet toddy. Availability of quick lime at higher degree of purity will ensure the maintenance of extreme alkaline pH of the sweet toddy with minimum amount of it.When tappers bring limed sweet sap to the production unit at different time periods few of them get fermented and it is also used for the production. This issue leads to the poor quality of jaggery. According to these basic principles this research is proposed for improving and standardizing the quality of palm jaggery. This project will upgrade the quality of palm jaggery and increase the market demand for palmyrah jaggery. Materials and Methods Matured and healthy female palmyah palms were labeled near to jaggery producing areas of Jaffna peninsula in the period of May to June. From this palm, well prepared and healthy inflorescence were identified for sap collection and the sap was collected in earthen pots, which was kept under hygienic condition. Selected inflorescences were tapped in the evening between 5 to 6 p.m to ooze out sweet sap. Before attaching sap collecting pots with inflorescence according to tappers experience day before experiment day with the inflorescence underwent experiment, known amount of quick lime with 96 % purity was applied to arrest fermentation. Four field trials were carried out. Fresh sap exudation was collected at morning between 7 to 8 a.m. The pH of the sweet sap in each pot was measured by pH meter2 and brix was measured by hand refractometer. Collected sweet sap in separate cans was brought to laboratory in aseptic, sterile and dark condition. Within one hour whole samples were pooled an d pH of pooled sap was measured. Jaggery was produced and packed in polyethyene packets. Sensory evaluation of produced jaggery was carried out to select best samples on the basis of sensory attributes. The colour, odor, appearance, flavor and texture were evaluated by 12 untrained persons. The total acceptability of the samples was evaluated using five point hedonic scale subjectively. Collected data were statistically analyzed using the MINITAB statistical analysis package according to the Freedman nonparametric test at 5 % level of significance. Results and Discussion Different field visits were conduct to optimize lime for the processing of palm jaggery and all the summarized results were recorded in the table 01. In field visit 1 (T1), field visit 2 (T2), field visit 3 (T3) and field visit 4 (T4) amount of applied quick lime were 4.668 Â ± 0.847 g/L, 3.188 Â ± 0.242 g/L, 2.508 Â ± 0.411 g/L and 2.051 Â ± 0.833 g/L and pH of them were 11.51, 10.62, 9.43 and 8.23 respectively. According to Sri Lankan Standard1 fresh jaggery samples from T1, T2 and T3 field visits at the time of packaging moisture content of all was below 10 %. Sweet sap samples with pH between 7 and 8 quickly changed into acidic medium with time and this indicates the microbial activity is present considerably. Jaggery from field visits 4 shows melting property and moisture content was below 12.5 %. It was identified that fermented sweet sap also course melting of jaggery. Therefore pH of sweet sap needs to be maintained above pH 9 in large scale application. For the suitable jaggery production without deliming step 2.508 Â ± 0.411 grams of lime (96 % purity) per one liter of sweet sap was optimized. Table 01: Summary of all field visits Sensory evaluation Sensory data obtained through the five point hedonic evaluating test, revealed that there were significance difference in colour (p = 0.012), appearance (p = 0.003) and texture (p = 0.001) characteristic among the jaggery samples produced in the laboratory. However there were no significant difference in flaver (p = 0.296) and mouth feel (p = 0.145) among the samples. The sample code 115 gained the highest sum of the rank for the colour, appearance, and texture. Therefore code 115 sample was selected as best sample Produced jaggery in laboratory scale from all the field visits, according to the sensory evaluation quality of colour, texture and appearance were increased with decreasing pH. Produced jaggery sample from each field trials were in the figure 01. Table 02: sensory attributes of the jaggery Figure 01: Jaggery samples from four field visits (codes 175, 101, 115 and 142 were jaggery samples from first, second, third and fourth field visits respectively.) Conclusion Palmyrah jaggery would be a most popular sweetener in Srilanka. However it shows poor physico-chemical qualities. On the basis of facts jaggery can be produced without deliming step from fresh, unfermented and filtered sweet sap of palmyrah palm. Sweet sap should be maintain in pH 9 by using purified quick lime to arrest fermentation and it can be useful to get quality improved jaggery as high consumer acceptance in market. References SLS 512: 1981-Specification for jaggery – moisture content. Pp. 23 Mandal D, Tudu S, Mitra SR, De GC (2006). Effect of common packaging materials on keeping quality of sugarcane jaggery during monsoon season. Sugar Tech., 8(2/3): 137-142.

Tuesday, November 12, 2019

Galaxy and Dense Gas Passes

Comparing a yellow star, a blue star, and a red star, we could determine Just from color that the hottest star was the 10. One. BLUE Rotation curves of spiral galaxies show that stars' orbital speeds don't drop off with distance from the galactic center as expected, and thus imply the existence of . The main sequence includes the following kinds of stars: B) Hot, blue, large, massive ones and cool, red, small, low-mass ones 12. Which of the following was not an era In the history of the universe?The phases of the moon are caused by D) The alignment of the Earth/moon/sun system making a different portion of the Spectra help us determine the composition of astronomical objects because A) Each element, compound, or ion has a different set of spectral lines. 15. Dark energy is the most important factor in the of the universe. A) Accelerating 16. Universe scenario for the fate The outer planets are more massive than the inner planets because C) Both of the above 17. The three basic types of galaxies are B) Spiral, elliptical, and irregular. 8. A planet orbiting a star feels a force due to the star's gravity that C) Increases with the star's mass and decreases with the square of the distance. 19. Massive main sequence stars A) Have hot cores, use their hydrogen rapidly, and go supernova after a short life. 0. Hubbub's law gives us an indirect way to measure a galaxy's D) Distance. 21. We can determine an object's temperature from its thermal (or â€Å"blackbody') spectrum by finding the wavelength at which it emits the most electromagnetic radiation.Galileo findings from his telescopic observations were revolutionary because he showed that the heavens were not perfect. B) FALSE 28. If the sun had begun fusion later, so it did not clear the solar nebula of its remaining gas so soon, Uranus and Neptune might have become as large as Jupiter and Saturn are now. A) TRUE 29. If the sun somehow instantaneously became a 1 solar mass black hole, the Earth According to Hubbub 's law, the reediest of a distant galaxy is directly related to its temperature. B) False