Earlier in this astronomy series, we learned about the creation of stars and galaxies, and how the period between 150 million years to a billion years after the big bang was the first generation of stars in the universe that accumulated hydrogen and helium. Does. This process continues, and any cloud and dust, also known as nebula, can produce stars today, which is why the large nebula is regarded as a stellar nursery. To be clear, when we say gas, we are referring to hydrogen and helium, which is the most common case in the universe, because it came about by the big bang nucleosynthesis before any stars existed. In contrast, when we say dust, we are referring to all the heavier elements, which must be fused inside the stars, which were first shown in interstellar space, when the first stars started moving into Nova and Supernova, Due to which their contents were spread in the universe. When gas and dust collect by gravitational collapses to form a new star, it will be accompanied by a protoplanetary disk, and this is the material from which the planetary system is formed. The nebula and the protoplanetary disk are fascinating features that we can study with binoculars, and many nebulae are very well known, so now let’s take a look at some of these. One of the most famous of these structures is called the Pillars of Creation, which inhabits the Eagle Nebula, about 7,000 light years from Earth. It is quite important to get a sense of a more three-dimensional effect for the dynamics of this object as well as clarity. To establish scale, this four tallest pillar is four light years longer than Isabel, which is the distance to the nearest other star from the Sun, and with the edges a little wiser than our entire solar system. These structures are heated by star birth, hence their name, and there are many others in the galaxy that perform similar functions. Now let’s go and find another nebula. This time we will zoom in on a familiar constellation, Orion, hunter, one of the most famous and most recognized constellations. If we move towards the middle star in the Orion keward, we find the Orion Nebula. At only 1,300 light years away, it is visible to the naked eye, and is the closest region to our own system making it an active star. Because it is so close, it is a great source for star-making. Within the Orion Nebula, we can observe protoplantrydesis, and gather knowledge about system formation.
We can also see here for a better understanding that nebulae acquire their interesting shapes, because new stars generate a lot of radiation for their birth, which we call stellar wind, and this stellar wind with nearby gasand dust, Can also help in certain areas. Construction of other wires. This is particularly noticeable near Orion with another barrier known as the Horsehead Nebula. In addition to the NGC, or New General catalog number, like this structure, several nebulae have been given creative names, Cat’s Wind Nebula, another star that is about five to six thousand light years away.
This nebula is referred to as an excretory gland, so let’s look at the types of nebulae so that we know what it means. There are emission nebulae that glow brightly. It is caused by the radiation of newborns, which not only heats gas and dust, but also ionizes it, and all this ionized gas emits a lot of visible light. In contrast, a reflection nebula is one that does not emit a lot of light, but rather reflects light from nearby stars. The emission nebulae and the reflected nebulae are types of diffuse nebulae, meaning that they do not have a well-defined shape, they are amorphous clouds of gas and dust. The third type of diffuse nebula is called the Dark Nebula.
These do not emit or reflect too much light, preferring the other two types, but instead become noticeable in the way they block light from luminousobjects behind them, causing them to form dark opaque clouds. appear in. The Horsehead Nebula is an example of a dark nebula. So that the cover spreads the nebula, which can be very large, many of which serve as stellar nurseries. But a specific event involved in the lifetime of a star also results in very small nebula threads. One variant of such a nebula would be a supernovar. When very high-mass stars run out of fuel, they explode into a supernova, as we learned in a previous tutorial. Expansive shells of gas and dust form beautiful expansion structures, such as this one, called the Crab Nebula. This object is the result of the supernova Theva appearing in the sky in the year 1054, and appeared for about two years as isdocumented by Chinese and Arabic civilizations. All that is left now is this nebula and the then neutron star at the center, which were once the remains of that star. Conversely, when low-mass stars die, they leave behind a planetary nebula.
T phase, and ultimately their outer layers to leave a rear seat rejected. It is nowhere near as explosive as a supernova, but it repels a beautiful nebula. Some examples of plant nebula include cat eye nebula, oyster nebula, helix nebula and ring nebula. Finally there are even protoplanetary nebulae, which occur at a specific stage in the short-term life cycle, between a specific phase of the short-term life cycle and between the nebula phase of the planet. At this stage, the substance is released and ionized, forming these structures, such as the Westbrook Nebula, and Gomez’s hamburger. The nebula has sincerely fascinated astronomers. Only in the last few centuries have we begun to understand what they are, and only in the last century have we begun to understand the Thyster life cycle to appreciate the origin and function of these incredible structures. Our growing understanding only enhances their beauty, which we will continue to enhance in the coming decades of research.