Formation and Types of Irregular Galaxies

The word galaxy brings to mind images of the  Milky Way  or perhaps  the Andromeda galaxy, with their spiral arms and central bulges. These  spiral galaxies  are what people commonly imagine all galaxies look like. Yet, there are many types of galaxies in the universe and theyre not all spirals. To be sure, we live in a spiral galaxy, but there are also elliptical (rounded without spiral arms) and lenticulars (sort of cigar-shaped). Theres another set of galaxies that are rather shapeless, dont necessarily have spiral arms, but do have a lot of sites where stars are forming. These odd, blobby ones are called irregular galaxies.  Sometimes they get lumped in with the so-called peculiar galaxies due to their unusual shapes or other characteristics. Hubble Space Telescopes deepest view of the cosmos. There are hundreds of galaxies of all shapes and sizes in this image. NASA/ESA/STScI As many as a quarter of known galaxies are irregular.  With no spiral arms or central bulge, they dont seem to visually share much in common with either spiral or elliptical galaxies. However, they have some characteristics in common with spirals, at least. For one thing, many have sites of active star formation. Some may even have black holes at their hearts. Formation of Irregular Galaxies So, how do irregulars form? It seems that they are typically formed through gravitational interactions and mergers of other galaxies. Most,  if not all of them began life as some other galaxy type. Then through interactions with each other, they became distorted and lost some, if not all of their shape and features. Hubble Space Telescope looked at a pair of colliding galaxies that are tangling as they interact. NASA/ESA/STScI Some may have been created simply by passing near another galaxy. The gravitational pull of the other galaxy would tug on it and warp its shape. This will happen particularly if they pass near larger galaxies. This is likely what happened to the Magellanic Clouds, the smaller companions to the Milky Way. It appears that they were once small barred spirals. Because of their close proximity to our galaxy, they were distorted by gravitational interactions into their current unusual shapes. The Large Magellanic Cloud (middle left) and Small Magellanic Cloud (upper center) over Paranal Observatory in Chile. European Southern Observatory Other irregular galaxies seem to have been created through mergers of galaxies. In a few billion years the Milky Way will merge with Andromeda galaxy. During the initial time of the collision, the newly formed galaxy (which is nicknamed Milkdromeda) may look to be irregular as the gravity of each galaxy pulls on the other and stretches them like taffy. Then, after billions of years, they may eventually form an elliptical galaxy. This NASA/ESA Hubble Space Telescope image shows the massive elliptical galaxy Messier 60 (also called M60, or NGC 4649). NASA/ESA/STScI Some researchers suspect that large irregular galaxies are an intermediate step between the merger of similarly sized spiral galaxies and their eventual final forms as elliptical galaxies. The most likely scenario is that two spirals either mingle together or simply pass very near each other, resulting in changes to both partners in the galactic dance.   There is also a small  population of irregulars that dont fit into other categories. These are called dwarf irregular galaxies. They also look a lot like some galaxies as they existed early in the history of the universe, without a definite shape and looking more like a shred of a galaxy. Does this mean that the irregulars that are observed today are more like early galaxies? Or is there some other evolutionary path that they take? The jury is still out on those questions as astronomers continue to study them and compare younger to the ones they see that existed many billions of years ago. Types of Irregular Galaxies Irregular galaxies come in all sorts of shapes and sizes. This is not surprising considering  they may have started out as either spiral or elliptical galaxies  and simply distorted through the merger of two or more galaxies, or perhaps by nearby gravitational distortion from another galaxy. However, irregular galaxies can still fall into a number of sub-types. The distinctions are usually associated with their shape and features, or lack thereof, and by their size. Irregular galaxies, particularly the dwarfs, are still not well understood. As weve already discussed, their formation is at the heart of the issue, particularly as we compare old (distant) irregular galaxies to newer (nearer) ones. Irregular Sub-types Irregular I Galaxies (Irr I): The first sub-type of irregular galaxies are known as Irr-I galaxies (Irr I for short) and are characterized by having some structure, but not enough to classify it as a spiral or elliptical galaxies (or any other type). Some catalogs break this sub-type down even further into those that exhibit either spiral features (Sm) - or barred spiral features (SBm) - and those that have structure, but not structure associated with spiral galaxies such as a central bulge or arm features. These are therefore identified as Im irregular galaxies.   Irregular II Galaxies (Irr II): The second type of irregular galaxy does not have any feature what so ever. When they were formed through gravitational interaction, the tidal forces were strong enough to eliminate all identified structure of what galaxy type it may have been previously. Dwarf Irregular Galaxies: The final type of irregular galaxy is the dwarf irregular galaxy mentioned above. As the name suggests, these galaxies are smaller versions of the two sub-types listed above. Some of them contain structure (dIrrs I), while others have no trace of such features (dIrrs II). There is no official cut-off, size-wise, for what constitutes a normal irregular galaxy and what is a dwarf. However, the dwarf galaxies tend to have low metallicity (that means that they are mostly hydrogen, with low amounts of heavier elements). They may also form  in a different way than normal-sized irregular galaxies. However, some galaxies currently classified as dwarf Irregulars are simply small spiral galaxies that have been distorted by a much larger nearby galaxy. Edited and updated by Carolyn Collins Petersen.

Is Body Image A Balance And Inner Peace Within Oneself

No one person is perfect and many suffer from emotional maladies, addictions, and general problems that are persistent and unceasing. How these afflictions are dealt with varies person to person, but it often involves trading one vice to treat another. Of course, certain conditions require special treatment, but many common issues can be dealt with by find a balance and inner peace within oneself. This calmness and enlightenment may not be quick fix, but the reward is well worth the effort. Depression Depression, sadness, and grief are natural emotions and you should accept that these feelings are normal. Fighting against how you feel will only worsen the problem, or make you feel guilty for struggling with these emotions. Allow yourself to feel how you feel and gradually encourage yourself to break free from the constraints of negative emotions. Focus on the positive when it arises and find things, even little ones, to look forward to and get excited about. Body Image It s common not to like certain aspects of your body, but learning to love your body for all its flaws and imperfections will open you up to accepting yourself as a whole person. Embrace your problem areas, but don t obsess over changing them. Do your best to stay healthy and active with regular exercise, but be realistic. Drug Abuse Drug and alcohol addictions are serious and often require a drug rehab program to begin the process of getting better, but once the rehabilitation portion is complete, youShow MoreRelatedThe Eternal Quest for Inner Peace1012 Words   |  4 Pagesâ€Å"Inner peace is the greatest success; it makes your world a Paradise.† Inner peace can be defined as state of being mentally and spiritually at peace, with a sense of understanding which keeps oneself strong against stress. It is always associated with happiness, bliss, satisfaction and contentment. 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Concentration Camps Free Essays

Concentration camps were constructed for mass killings. Digging deeper into the methods of murder they used, there’s more to it than gas chambers, starvation, and overwork. The medical experiments were a major factor in the massive death toll in the concentration camps. We will write a custom essay sample on Concentration Camps or any similar topic only for you Order Now Today doctors strive to keep people healthy and alive. For Nazi doctors Joseph Mengele, Karl Clauberg, and Sigmund Rascherat, the ones responsible for countless deaths, that was not their number one priority. Nazi doctors in the concentration camps conducted inhumane experiments such as examining twins, sterilization of men and women, and the freezing of people. When prisoners arrived at the camps, they probably expected the worst. For the twins however, life in the camps wasn’t as bad as it could’ve been. Twins were allowed to keep their hair and sometimes their clothes (Remember.org, 4). Being a twin gave them a better chance of surviving (Lifton, 351). Even though the experiments were cruel and barbarous, they offered an escape from the harsh camp (Lifton, 354). Twins lived in special buildings, such as the medical blocks. Unlike normal prisoners, twins were able to move freely throughout camp. Within the blocks, the father of a set of twins would be assigned block chief (Lifton, 348). Young female twins were lucky in a way since their mother was allowed to stay with them. The reasoning behind this is, Joseph Mengele, the mad man behind these experiments, wanted them in stable mental and physical condition (Lifton, 349). No matter how healthy they were, nothing could prepare the twins for what was to come. The Nazi’s thought that twins were the key to discovering a way to quickly increase the German race. Doctors hoped to uncover the secret to multiple births (Pbs.org, 3). In order to conduct experiments, Mengele needed twins. He exploited easy access to twins at Auschwitz and was a fanatical figure in the selection (Lifton, 348). In 1944, 250 individual twins arrived in Birkenau (Lifton, 349). The selection process began with Mengele shouting, â€Å"Zwillinge heraus!†, which means twins in German. Once rounded up, they were each given a number sequence on their arm (Lifton, 348). Identical twins were the ones Mengele wished for the most, as they were his most treasured research objects (Lifton, 349). Although the experiments sound like Nazi’s tourtering prisoners without any medical knowledge, there was a method to the madness. Mengele’s method was based off of scientific training, Nazi ideology, and the peculiarities at Auschwitz’s setting (Lifton, 347). When twins were examined, they were examined together and naked (Lifton, 349-350). Measurements of every part of their body were taken (Remember,org, 4). Each session, ten cubic centimeters of blood were drawn and during the first examinations the family history of the twins was taken (Lifton, 350). Today we can look at an actual experiment performed on a set of identical Hungarian twins. Selection began in 1943 when three sets of twins arrived at Auschwitz. Dr. Mengele saw the Hungarian set and took them (Remember.org, 4). They were 18 year old men and described as very handsome and athletic. Examination began right away with their heads, which took several days. Next photographs were taken to show hair growth. The most dangerous thing done to them while they were alive was being ventilated with gas. They coughed so severely, restraints were needed to hold them down. After the gas, they were placed into hot water up until the point of passing out and then all their hair was removed; more photographs were taken. The Hungarian twins were killed the same way as every other set that made it to the end of the experiments. A syringe of chloroform was injected into their hearts. Mengele was very careful to make sure the twins died at the exact same time. Once no longer alive, they were dissected and their organs were sent to the Institute of Biological Racial and Evolutionary Research Berlin (Remember. Org, 4). Dissection of the corpses was the last part of Mengele’s twin research (Lifton, 350). These experiments were drastic. Of the 1,000 pairs experimented on, only 200 pairs survived (Pbs.org, 3). Sadly, this was not the end of cruel Nazi medical experiments; sterilization of prisoners was also very important to the Germans. Sterilization: surgery to make a person unable to produce offspring. The main goal of sterilization was to discover a rapid, inexpensive, and unobtrusive method to wipe out Russians, Poles, Jews, and other races (Berenbaum, 347). Nazis hoped to sterilize millions with minimum time and effort (Pbs.org, 5). Even though a method already existed, surgical sterilization, doctors thought it was too slow and expensive. These experiments occurred in camps such as Auschwitz and Ravensbruck (Berenbaum, 247). There were mainly two doctors known for sterilization, Gebhardt and Clauberg. Gebhardt worked at Ravensbruck by the surgical method. The method Clauberg used was by an injection. Dr. Karl Clauberg conducted it on a large scale (Berenbaum, 348). He was the main man for sterilization (Lifton, 271). Although the doctors knew how they wanted to sterilize, a formula had to be developed. Since Dr. Clauberg was the head of these experiments, he developed his own formula, but he was very secretive about the substances he used. Researchers today assume he used formalin and novocain (Lifton, 271-272). Formalin is a clear watery solution of methanol used as a preservative. Novocain, also known as procaine, is a local anesthetic drug used as a sodium channel blocker. This impairs the conduction of sodium ions. This injection was done in three stages over a few months. Unfortunately, Clauberg used over 300 women over the course of his work (Lifton, 272). Not just women had to face the horrors of Dr. Clauberg, thousands of male Jews and Gypsies were sterilized at Auschwitz by injection. Later on, doctors discovered a brand new method, x rays. This way was effective, but castration would result. There were also dangers to other parts of the body if not covered by lead (Berenbaum, 348). Even though the Nazi doctor’s main goal was to sterilize, other issues occured. Thousands who were sterilized suffered excruciating mental and physical pain (Pbs.org, 5). Fever also overtook many victims. Some prisoners were very resistant but many feared what would happen if they were. Prisoners who resisted were sent to the gas chamber at Birkenau (Lifton, 272). Knowing each day what would be done to them by Clauberg caused them to be overcome with fear and anxiety (Lifton, 273). Of course sterilization was extremely painful and killed many people, but the freezing experiments were the most painful experiments the Nazi’s conducted. A problem Germany had during World War II was when their pilots in planes had to eject into the ocean, they would die from hypothermia. Nazi’s number one goal was to discover a way to treat frozen German pilots (Pbs.org, 2). These experiments were designed to simulate conditions on the eastern front and were conducted for the Nazi high command. Some camps had the perfect weather conditions; Birkenau, Dachau, and Auschwitz (Remember.org, 2). Two methods used were an icy vat of water and using the sub-zero temperatures outside. Each experiment was divided into two parts. The first part, Sigmund established how long it took for body temperature to lower to death. During the second part he tried to find the best way to revive the frozen person. Through tests, Sigmund figured the icy vat method was the quickest way to drop body temperature (Remember.org, 2). Before the prisoners were placed in the icy vat, they were either given an aviator suit or wore nothing at all. They were each in the vat for up to five hours at a time. Once their body temperature fell to 79.7 degrees fahrenheit, Sigmund would throw hot sleeping bags or use scalding baths to rewarm them (Pbs.org). The second method was conducted outdoors. Dr. Sigmund strapped prisoners to a stretcher and placed them outside. Auschwitz was one of the most ideal places for experiments outside because of the extreme winters. Eventually after suffering in the cold for hours, most victims lost consciousness and died once their body temperature dropped (Remember.org, 2). Throughout the whole experiment, Dr. Sigmund was constantly measuring the changes in heart rate, body temperature, and muscles flexes (Pbs.org, 2). Although not many survived, there is a documented experiment done on two men. These men were both from Russia and once at the camp they were both sent to the icy vat. A long time after being submerged in the vat, neither of the men were losing consciousness. Realizing not much was happening, Dr. Sigmund lowered the temperature. Shortly after this, both of them passed away. Everyone apart of this experiment were shocked at how long they lasted (Remember.org, 2). All in all, 80 to 100 people died due to these freezing experiments conducted in icy vats or in sub-zero temperatures (Pbs.org).Nazi doctors were ruthless and would’ve done anything for the name of science. No matter how many people they killed, they were determined to get rid of the Jews, Gypsies, and other races. Even examining masses of twins, attempting to sterilize millions of men and women, and pushing the human body to as cold as it could go. These medical experiments caused hundreds of deaths and gives the title doctor a dark background. How to cite Concentration Camps, Papers

The Right of Children and Young Person free essay sample

This was aimed at understanding children better and for the Filipino teacher to be more aware of the children’s rights. The code contained the following provision: To understand and help children better, it is important for every Filipino teacher to be cognizant of such rights. The provisions of the Code regarding such rights are as follows: All children shall be entitled o the rights herein set forth without distinction as to legitimacy, sex, social status, religion, political antecedents, and other factors. 1. Every child is endowed with dignity and worth of a human being from the moment of his conception, as generally accepted in medical parlance, and has therefore, the right to be born well. 2. Every child has the right to a wholesome family life that will provide him with love, care and understanding, guidance and counseling, moral and material security. . Every child has the right to a well-rounded development of his personality to the end that he may become a happy, useful, and active member of society. We will write a custom essay sample on The Right of Children and Young Person or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page 4. Every child has the right to a balance diet, adequate clothing, sufficient shelter, proper medical attention, and all the basic physical requirements of a healthy and vigorous life. 5. Every child has the right to be brought up in an atmosphere of morality and rectitude for the enrichment and the strengthening of his character. 6. Every child has the right to an education commensurate with his ability and to the development of his skills for the improvement of his capacity for service to himself and his fellowmen. 7. Every child has the right to full opportunities for safe and wholesome recreation and activities, individual as well as social, for the wholesome use of his leisure hours. 8. Every child has the right to protection against exploitation , improper influences, hazards, and the other conditions or circumstances prejudicial to his physical, mental, emotional, social , and moral development.