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How Galaxies Grow by Camille M. Carlisle (Article Review)

The article selected for review is How Galaxies Grow by Camille M. Carlisle. At the beginning of the essay, the author refers to the people who do not have enough knowledge when the topic of galaxies is brought up (Carlisle). A common perception among people is that bigger galaxies collide with one another and their cannibalistic fervour leads them to deform the smaller galaxies. Astronomers have been studying the galaxy’s formation for 10 billion years now. The universe’s structure has always been a cause of piquing the astronomer’s interest. The author wishes to show the reader how galaxies have formed and expanded over the years. Carlisle refers to the astronomer debate over the concept of merging between galaxies. She wants to end the confusion that people have in their minds regarding the phenomenon that allows galaxies to become so massive.

The article aims to educate the reader on galaxy growth by explaining the science and theories behind galactic merges, the roles multiple variables such as size ratios and gas amounts fulfil and their effects. Carlisle has included reports on galaxies and their structures conducted by different astronomers. From the onset of the article, Carlisle mentions the process of merging and what effect it carries on the constellations. According to Carlisle, astronomers apprehend galaxy formation by looking at the creation of stars. Galaxies expand by grabbing stars from elsewhere or finding gas to make their own. The author talks about the types of present mergers, such as the minor merger that can wrap itself around a disk and make spaces for star formation. The author mentions that mergers aren’t the only source that allows galaxies to interact. Galaxies can suck up gas from its surrounding and pull other galaxies towards themselves and in the process form a union.

The author talks about star formation and how galaxies play an essential role in star formation. The different kinds of galaxies have different capacities to store gas that is needed for the birth of a star. An example of spiral galaxies is given in the article, and its function has been highlighted. In the latter half of the section, Carlisle further delves into the role played by mergers while talking about the growth of the Milky Way over the years. By studying the expansion of the Milky Way, the increase in the other isolated galaxies can be understood. An important aspect to be noted is that astronomers do not have unique instruments to study the galaxies thoroughly. A biologist will have tools that allow him or her to review the fossils while an astronomer does not.

The author has used a lot of scientific terms throughout the article that have not been explained thoroughly. While there have been references to what the different schools of astronomy think about the evolution of galaxies, the author could have done much better if the formation of stars and galaxies had been discussed in general before delving into what other astronomers had to say. However, the author did meet the requirements of the essay and fulfilled the purpose behind writing this article. The formation of galaxies was explained thoroughly at the start of the composition, and then the star formation and the role of mergers were described to help the readers understand how everything took place in space. The author deviates here and there from her initial objective, but it is all tied down in the end.



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