What is Nebula, What are its Types?

Nebula

Did you obtain lost in the’nebulae’deep in the sky in a sufficiently dark and cloudless summer night? Probably your eyes are on the Orion Nebula … The nebula that play the leading role in many space photographs are extremely intriguing and magnificent space formations. For centuries, astronomers have thought nebulae that appear like clouds in space are distant galaxies. Today, a whole lot more concrete information has been obtained about these formations.  How can nebula occur? What are their types and examples

What exactly is Nebula, how does it look?

Nebula are’nebulae’structures situated in the spaces involving the stars. They include dust, hydrogen, helium and other ionized gases; they become visible with in the light energy emitted from the star. Due to its’nebula’structures, its name arises from the Latin word’cloud ‘. But a nebula is significantly more than a cloud of dust and gas. Because it can be where the stars are born and die … Some nebulae host the birth of new stars. Others contain the remains of dead or dying stars. Although they look like tiny clouds when viewed with the naked eye, their diameter can reach hundreds of light years. Nebulas, the sizes of which is often completely different, take different shapes.

How was Nebula Discovered?

In the past, most astronomical objects, including galaxies, were thought to be nebulae. Astronomers thought that until about 100 years ago, the universe consisted only of the Milky Way Galaxy, where we’re located. In those days, other galaxies observed through the telescope were thought to be’local’nebulae in the Milky Way, and were called’spiral nebula ‘. That is the key reason why many galaxies are called nebulae in ancient astronomy sources. So much to ensure that even the Andromeda Galaxy was called the Andromeda Nebula.

It absolutely was understood by astronomer Edwin Hubble that nebulae were actually formations in the spaces involving the stars. In 1919, Hubble began studying a’spiral nebula’with the 2.5-meter Hooker Telescope, the world’s largest telescope during the time, at Mount Wilson Observatory in California, USA. With this research, he’d change the history of astronomy. When he seen that the “spiral nebula” were past an acceptable limit to be contained in the Milky Way and that there have been other galaxies on the cornerstone of the formations defined as nebula to date. Thus, he proved that the universe is not merely “our galaxy.” Consequently of this historical discovery, this is of nebula changed and took its present form.

We now know that there are at least 100 billion other galaxies, each with a huge selection of billions of stars, and many of these stars likewise have planets. Astronomers have got all the information through nebula research.

How Is Nebula Made?

Nebulas are generally fading or extinct stars, and areas where new stars are formed. Each nebula is a star before it forms. So how can stars die, how can a nebula and a brand new star emerge from this death?

The stars die following the fusion reactions of the gases they contain end. As the reactions where hydrogen gas turns into helium atoms end, that is, as hydrogen starts to perform out and fuel decreases, the stars begin to develop and first develop into a “red giant “.In this method, with the effect of the pressure and the temperature reaching 100 million degrees, they collapse inwards using one hand and they start releasing gas into space. Next stage, stars can become a white dwarf, a neutron star, or perhaps a black hole. The gases they emit into space form a nebula whose temperature rises above 15 thousand degrees. Here, this dust and gas cloud from the dying star is named a nebula.

What’s Supernova?

Nebulas also can form after supernovas, which are believed one of the very magnificent space events. Stars sometimes emit gas and explode once they reach the red giant stage. These explosions, which occur in the death of certain kinds of stars and give spectacular images, are called supernovas. Nebulae formed after supernovas look a lot more messy.

How Is A Star Born From Nebula?

Nebulae formed by the death of stars will also be formations by which new stars arrived at life. A fresh fusion reaction between gases begins in the nebulae, where the remaining gases from the dead star converge consequently of gravity and whose temperature exceeds 15 thousand degrees. While the main star completes its life as a metal and carbon pile, new fusion reactions between the gases it leaves result in the formation of a new star. The brand new star sprays gas, though not around the old star from which it absolutely was born.

Classic Nebula Types

Nebulas are split into four main groups among themselves. Before the nature of the nebula was fully understood, the galaxies were called’spiral nebula’while the stars that have been too much from being identified were counted as nebula. Although such references are encountered in old sources, this definition has disappeared today.

 

Sources :
İmage 1 : https://kayiprihtim.com

 

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