In the article, “A lot of galaxies need guarding“, from sciencedaily.com, talks about an image from the Hubble Space telescope of a galaxy cluster called Abell 370. The article makes a reference to the new movie Guardians of the Galaxy Vol. 2 saying that there are to many galaxies with the need of guarding with the image below. This cluster contains several hundreds of different galaxies that are tied together by the mutual pull of gravity. Spiral, Elliptical, Barrel, and Irregular galaxies can be seen in the image.
This article relates to our conceptual objective, “I can compare the Milky Way Galaxy to other galaxies”, because the image above shows the many different types of galaxies in one cluster. The universe contains many galaxies with similarities such as disks, lots of dust, stars, a center bulge, and gas. But there are many galaxies that are different types such as: Irregular, Barrel, Elliptical, and Spiral galaxies. In Irregular galaxies, they have a shape that’s neither rounded or disk-like. They are basically a group of stars, gases and dust with no particular shape. These galaxies were believed to be formed by the end result of collisions or interactions with galaxies. Since these types of galaxies tend to have a large amount of gases and dust, star formation is highly active making the galaxy appear blue. Barrel galaxies are basically spiral galaxies but have a line of stars and dust that are extended outward from the center bulge. In Elliptical galaxies, are the oldest galaxies in the universe and lacks the gas and dust to produce stars. Since the stars are older in the elliptical galaxies compared to the others, it makes the elliptical galaxies appear more red, orange, and yellow. In Spiral galaxies, such as our Milky Way, has a more structured shape. They have a center bulge in a flattened disk and even has arms extending around the center. Most of the star formation comes from the arms making them appear blue compared to the older stars closer to the center making it appear red. The image below shows the different types of galaxies. We know this information because in class, we worked on our lecture-tutorial pages 139-142 about galaxy classification. We categorized and classified many different galaxies by their characteristics
This conceptual objective was really interesting to learn about. After reading the article, I’ve never imaged the amount of galaxies needed to be guarded in one cluster. This really gives a new meaning to the guardians of the galaxies. I really like learning about the collision of galaxies and how the end results look like. I’m curious if there are any other forms of galaxies. I love the fact that the galaxies basically recycle dying stars in order to form new ones.