The form of Galaxies in the universe is diverse. Who does not know the galaxy, where the earth including the Milky Way galaxy is famous for its planetary structure. Includes the planet that man places. The galaxy itself is a system that can be said to be passive and bound by the force of gravity which consists of various celestial bodies such as stars, and all its formations, gas, dust between interstellar medium, and dark matter that may have never been studied or have not found the description of its components. The galaxy forms a system seen from a distance like a group that separates itself from a very wide space. Therefore, if viewed or studied, the galaxy is not just one but many.

Galactic Forms
The Milky Way galaxy is a galaxy occupied by humans today. Its forms include spiral galaxies and shaped like discs, with a diameter of about 100,000 light-years across.

It means very wide and must travel trillions of KM. For the count of light, with a speed of 300,000 KM per second it takes one year to travel, so a light year can travel up to 9.5 trillion KM.

Surely this midline is sufficient to explain that the galaxy is very large and also stretched wide despite the fact, but in fact we can still feel the heat of the sun.

For ease we try to use the distance unit that is light years, if by using this unit thick the center of our galaxy about 10,000 light years. So what about the location of the sun in the Milky Way made as the center of the galaxy. Then the sun lies about 30,000 light years from the center of the Milky Way. The Sun is actually not a special object in the galaxy, but only one of billions of stars of the members of the Milky Way. With that, we must be grateful to live on earth with the protection of a very good planet. So that no meteors or stars fall to earth and cause the burning of objects on earth.

These galaxy star members are scattered at distances from one star to another, ranging from about 5-10 light years away if we move closer to the center of the galaxy, then the density of the interstellar distance is closer. Because the gravity of the galaxy towards the center of course the greater.

When viewed from the morphology, the galaxy can be divided into three types of spiral galaxies, elliptical galaxies and irregular. This division is certainly based on the shape and appearance of the galaxy according to experts. The astronomers also observed that there are 75% of spiral galaxies, 20% of elliptical galaxies and the rest are irregular when judged by the extent of the universe that can be reached by astronomers' observations. Of course, assisted using sophisticated equipment and also renewed. For the results of the ellipse itself is the largest galaxy that is in the universe just this galaxy is quite difficult to observe and many who have dim light and even dark total.

1. The Elliptical Galaxy
The elliptical galaxy or elliptical galaxy is a galaxy that has an elliptical or circular shape and has a fairly subtle level of brightness. One of the three classifications of galaxy morphology is described by Edwin Hubble in 1936 in his work entitled The Realm of the Nebulae and along with spiral and lenticular galaxies.

When viewed this galaxy as a round shape but rather flat and slightly elongated slightly down, Galaxy containing trillions of planets, stars and satellite is also this star was originally developed into galaxies elipstis and can turn into a spiral. But it turns out this opinion is wrong and causes the question to be replaced. Because elliptical galaxies have a younger age than spiral galaxies when compared through their age.

The average galaxy is composed of stars with an aging low, with a fairly thin interstellar medium and star formation activity is also minimal. It also tends to have large amounts of spherical clusters. The ellipse galaxy is believed to make up 10-15% of galaxies in large virgo clusters with this type of galaxy not the dominant type that exists in the universe as a whole. But this type is often found at the center of cluster of galaxies. The elliptical galaxy is generally referred to as early galaxy because it is the most dominant type found in the universe.

2. Spiral Galaxy
The spiral galaxy is a beautiful and distinct galaxy. Where when viewed from binocular space then the shape is flat and also spin, with the contents of stars, interstellar medium and also the center of star concentration in the middle of the galaxy. This one type is one of the three types of galaxy morphology Edwin Hubble.

The name corresponds to a spiral-like shape in which the spiral arm extends from the center of the galaxy to the edge of the disc. The spiral arm is an ongoing star formation region so it is brighter than the galactic center. Being inhabited by hot young stars. About two-thirds of the entire spiral is known to have additional structural components similar to the rod and form the galactic center at the tip of the galaxy's spiral arms equally filled with its own planet and solar system, although there are no inhabitants.

The spiral galaxy is like a disc of matter and a star that rotates and a central bubble composed of old stars. There is a spiral arm extending into the central bloat, so the spiral galaxy is marked as type S followed by letters A, B and C to show and explain the density level. In addition, this galaxy is a galaxy with a large diameter.

The Milky Way itself is a galaxy in 1990 that has been confirmed to be a trunked spiral galaxy, although it is quite difficult to observe the Earth's position on the galactic disk. However, evidence that can corroborate these allegations is obtained from a survey conducted by Spitzer telescope on stars in the center of the galaxy. In addition the spiral shape forms 60% of all galaxies in the universe. According to research this galaxy is found in areas that have a low enough density and are usually rarely found galaxy clusters.

The spiral galaxy is divided into two spiral yani and also a barred spiral, wherein a spiral galaxy is a galaxy that has a catherine wheel with an arm and also a spiral out of the bright center. Perhaps it is this arm that looks to form like a chakra and also helps the galaxy is not an ellipse but a spiral. In addition there is a barred spiral shape with the galactic spiral arms out from the tip of a center and from the number of galaxies that have the spiral truncated to form a longer arm with the group at the end. Today the M1 galaxy is becoming one of the most popular spiral galaxies because of its beautiful and different shapes.

3. Irregular Galaxies
The irregular Galactic Shapes are galaxies that have no special shape, neither elliptical nor spiral. Where this galaxy is a galaxy with an unusual form that is incorporated into a classification. Overall this galaxy has an irregular shape because this galaxy is apparently affected by attraction or gravity.

According to Hubble there are two types of galaxies irregular:

1. Irregular galaxies Irr I
This galaxy has an asymmetric profile and there is no central spiral or clear spiral structure, mostly young stars and many individual groups. In addition, this galaxy consists of stars that do not exist in spiral galaxies

2. Irregular galaxies Irr II
This galaxy has a more subtle appearance but the same as Irr I is asymmetrical. Unfortunately until now it is still confused whether this star indivud and have a group of stars such as what because of the difficulty of researching stars in this galaxy.

This one type of galaxy is considered important in understanding the overall evolution of a galaxy whose type is likely to have very low metallicity and high gas content. So that the existing galaxies and initially formed are thought to originate from irregular galaxies.

In addition the irregular galaxies also have distortions by the gravitational forces of the larger galactic galaxies. An example is the Large Magellanic Cloud is the beginning of an irregular galaxy that exists today, but not all galaxies have no rod structure.

Additional Galaxies
Strange galaxies (peculiar galaxies) are galaxies that have unusual properties due to tidal interactions with other galaxies. An example is a ring galaxy, which has a ring-like structure of stars and interstellar matter that surrounds an empty core. Ring galaxies are thought to form when small galaxies pass through larger galactic nuclei. Such events may occur in the Andromeda galaxy which has some ring-like structures when observed in the infrared spectrum.

The lenticular galaxy is an intermediate form that possesses both the elliptic and spiral galaxies, and is categorized as type S0 and has a vague spiral arm and an elliptical star-shaped halo. (Barred lenticular galaxies receive Hubble classification SB0).

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