If you are an avid space enthusiast, it is critical that you learn all that you can about not only the planets, solar systems and galaxies themselves, you also need to understand the science behind studying them so that you can make the most out of it. With this in mind, one of the best and most useful facets that you can keep in mind is the Edwin Hubble classification system. The article below will teach you all about this system, so that you can further your knowledge of galaxies and space, so that you can use that info to the best of your ability.
What is this system?
This system was created by Edwin Hubble in the 1920s. At its essence, this is a classification system that you can use in order to break down and understand the various galaxies. In doing this, Hubble breaks down galaxies and places them into three different classifications. These three classifications are lenticular, spirals and ellipticals. The classification system has been so successful that it is widely thought of as the go-to way that galaxies are described and broken down. This remains the case for both professionals and amateurs who study astronomy, galaxies and solar systems.
What are these three galaxy designations?
If you are going to understand these galaxy classifications and how they work, it is important to learn more about lenticulars, spirals and ellipticals. By understanding these three, you will be well on your way toward understanding this Hubble classification scheme so that you can use it to the best of your ability when studying space.
The “tuning fork” diagram above shows us three of the four shapes used to distinguish the various galaxies, E0 and E6 represent variables Elliptical galaxies, while Spiral Galaxies are represented by S0, Sa, Sb, and Sc, and Barred Spirals by SBa, SBb, and SBc. The other classification, Irregular Shaped galaxies are not represented on the graph.
Read on to learn more about these three classifications:
This is a type of galaxy that consists of two spiral galaxies that branch out and join ellipticals. In many situations, this sort of galaxy is shaped like a disk and does not have a clear-cut spiral structure. When you take a look at these galaxies with scientific instruments, it may be evident that dust lanes and other forms of absorption are present. To get a full understanding of lenticulars, you must also study spirals and elliptical galaxies.
In order to learn more about galaxies, you should study spiral galaxies. These galaxies look like you would expect, and have a similar composition to a hurricane. They consist of parallel branches that appear flattened. They are joined by two arms of stars and also typically features some sort of bar like shape or composition. These are also broken down into a lot of different subsets, including Sa, which are usually tightly bound and very bright in the middle, Sb, which is also tightly bound but may have a faint center and Sc, which is typically pretty loosely combined and consists of several clusters. The Sd spiral galaxy is incredibly loose and does not have very much luminosity at all in the middle, but does have a good deal of luminosity around the arms.
These galaxies are the smoothest of all and have very faint features, though the light is very much distributed. Once the galaxy is photographed, it has the appearance of an elliptical shape. In terms of the Hubble diagram, this galaxy continuously increases as you read it from left to right. You will be able to break this elliptical down into many different categories based upon the angle that you are viewing it at.
In addition to these three subsets of galaxies, there are also some galaxies which cannot be defined by any specifically defined criteria. These galaxies are known as irregular galaxies, which are broken down into class I and class II irregular galaxies.
As you can see, the Edwin Hubble classification system is a widely used scientific category that you will need to know if you are going to study space further. With this in mind, take advantage of this information so that you can use it throughout your studies of space and learn more about the many different galaxies out there. This way, as you continue your research, you will have a greater understanding of how these factors come into play and can use these in order to deepen and refine the information.