8 Types of Deep-Sky Objects

8 Types of Deep-Sky Objects

8 Types of Deep-Sky Objects



Netgenz - Science | The universe has billions of the most amazing objects. Among the billions of objects that are in the form of nebulae, galaxies, or others. Some objects other than the private star and our solar system are called deep-sky objects, astronomical objects that have a fairly dim light, but if the view from the earth lacks light pollution, it really looks bright.

There are eight types of deep-sky objects popular among astronomers that are interesting to read. Yok, read the narrative!

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1. Globular clusters

Globular clusters


Globular clusters or globular clusters as deep-sky objects are believed by some astronomers to be the oldest objects in the universe. Globular clusters as a group of stars that make up a ball containing starting from 10 thousand stars to more than 1 million stars. Generally, the stars in this globular cluster are really old, around 11 billion years.

Some astronomers say that globular clusters are the quietest clusters in the universe because they contain old stars that are nearing their death period. Spherical clusters generally occupy the center of the galaxy. The spherical cluster has a very large size even up to 300 million light-years. When you see globular clusters it is the same as when you see how galaxies were originally created.

Some of the popular globular clusters include Messier 13, Messier 22, and Omega Centauri.

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2. Open clusters

Open clusters

The Eagle Nebula



Open clusters or open clusters as a group of stars that are both wrapped in gravity that generally contain young stars that are several hundred million years old.

The stars in this cluster are believed to have been created from one similar giant cosmic cloud. These clusters are usually on the outskirts of galaxies. Only spiral galaxies and irregular galaxies have open clusters. In addition, the stars in this cluster have a slack distance between their stars and are surrounded by cosmic clouds. This cluster is an important study of stellar evolution because this cluster is really active in giving birth to new stars.

Some of the popular open clusters include Messier 45 (The Pleiades), Messier 44 (Praesepe), and Messier 16 (The Eagle Nebula).

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3. Gas nebulae

Gas nebulae

Messier 42



Gas nebulae or what we know as nebulae are large clouds containing hydrogen and helium which are the building blocks of stars.

This nebula comes from a stellar explosion or what we know as a supernova. This nebula is really active in giving birth to new stars and most of the stars in this nebula are young, around a few hundred million years old. Some of the popular nebulae include Messier 42 (Orion Nebula), Messier 78, and Messier 43.

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4. Gas nebula with cluster

Gas nebula with cluster

The Omega Nebula



Gas nebula with clusters as an object that is almost similar to a nebula, but in this nebula, there are clusters of stars that are usually open clusters. Several gas nebulae objects with clusters include Messier 45 (The Pleiades) and Omega Nebula.

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5. Planetary nebula

Planetary nebula

Planetary nebula



Then there is the planetary nebula. This object is one of the objects that attract astronomers because this object is created from the explosion of a red giant star that leaves a white dwarf at its core.

Usually, the lifespan of planetary nebulae is quite short, around a few tens of thousands of years. When a star erupts, stellar material also scatters into space and produces a ring nebula. This object was the first time Messier had seen it. The small object in the center of the ring is the hottest white dwarf star.

Some of the popular objects include Messier 57 (Ring Nebula) and NGC 6543 (Cat's Eye Nebula).

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6. Spiral galaxies

Spiral galaxies

NGC 4535



Hearing the word galaxy, of course, is not foreign to our ears. Our planet is also in the galaxy, the Milky Way Galaxy. The Milky Way galaxy counts as a spiral galaxy. Spiral galaxies have the most obvious bumps at their core.

Galaxies contain stars, nebulae, and more. Usually, spiral galaxies are really active in producing stars. There are many types of spiral galaxies, namely Sa, Sb, and Sc. Type Sa has a disc that is close to the core, type Sc has the slackest disc in its entirety, and type Sb is the middle between the Sa and Sc types.

Spiral galaxies range in size from 5 to 100 kiloparsecs and have masses ranging from 10⁹ to 10¹² solar masses. Some of the popular spiral galaxy objects include the Milky Way Galaxy, Andromeda Galaxy, and NGC 628.

7. Elliptical Galaxies

Elliptical Galaxies

Messier 110



Apart from spiral galaxies, there are also elliptical galaxies. These galaxies are usually old and contain many globular clusters. This galaxy contains old stars that will soon meet their end. This galaxy does not produce stars, even this galaxy holds tightly to its old stars.

This elliptical galaxy is denoted by E. This galaxy has a type from E0 which is almost circular to E7 which is long and thin. Researchers believe elliptical galaxies to be where spiral galaxies collided in their early formation. In addition, researchers believe that at the center of the elliptical galaxy there is a supermassive black hole. This has really caught the attention of some astronomers to dig deeper into how the universe used to be.

Some of these popular objects are NGC 7052, NGC 4874, and NGC 1132.

8. Irregular galaxies

Irregular galaxies

Caldwell 21



In addition to ellipses and spirals, some galaxies are irregular. This galaxy is so full of dust and gas that it is really active in producing new stars. Some popular irregular galaxy objects include Caldwell 21, the large and small Magellanic Clouds.

Of course, the discovery of various deep-sky objects that are popular among astronomers cannot be separated from the development of current assessment technology. Some astronomers also believe that many secret objects in the universe cannot be achieved with today's technology. From the various types of objects above, have you ever seen them? If not, are you ready to hunt down deep-sky objects?

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