Introductory Speech
Everything that has been created in space since the Big Bang explosion has beencreated some one through a course of events. We know that star is a tiny part of space but this history of structure is broadest. Star is scattered state at the previous moment of creation. We call this state of the star a nebula. It is also called concentrator cosmic cloud. Now, we discuss about this wonder of nebula.
What is Nebula?
Nebula word comes from latin language, It,s means mist, vapor, fog, smoke. In short, it is a celestial cloud. It does not shed rain but is in the form of a cloud so it is called a cloud. Various kinds of gases and space dust accumulated in the space called nebula. Hydrogen, helium, plazma and different kinds of lonijable gases made by nebula, butmostly hydrogen then helium.
Classifications of Nebula
Although there are existent different kinds of nebula in the universys but scientists haveonly discovered a handful of them so far. Five types of nebula discovered so far arenotable.(1) Emission Nebula(2) Planetary Nebula(3) Reflection Nebula:(4) Dark Nebula(5) Supernova Remnant
Emission Nebula
Image Credit: NASAThe Supreme feature of emission nebula is its ability to emit light. The case abundance of Hydrogen, Helium, and different kinds of ionized gas. Light emitted from nearby starscombined with hydrogen and visible light is emitted after nuclei and electrons combinein hydrogen atoms. It,s temperature is extremely high. An emission nebula containsfrom 100 to 10,000 solar masses and its object spread can be less than one light year toseveral light years. Some emission nebula, Such as:- 1. Orion Nebula, 2. CarinaNebula, 3. Veil Nebula, 4. Lagoon Nebula, 5. Statue Liberty Nebula.
Planetary Nebula
Image Credit: NASAThis name ( Planetary Nebula) was the wrong selection. Early astronomers whoobserved planetary nebula through the ancient telescopes of the time saw them as a planet, but modern astronomers when saw this object they noticed its nebula, hence the name planetary nebula. It's formed by primarily hydrogen, helium, nitrogen, oxygen and some cosmological dast. It seems like seeing gas babble whose radius is generally one light year and contains 0.03 solar mass to something more. Its temperature can vary depending on the nebula element, such as a nebula with an abundance of gas can have a temperature of 10,000 K to 30,000 K but dusty planetary nebulas typically have temperatures ranging from 100 K to 300 K in their dust component. Ring nebula (M57), Helix nebula (NGC 7293), Cat's eye nebula (NGC 6543), Dumbbell nebula (M27), Butterfly nebula (NGC 3602) are some famous planetary nebula.
Reflection Nebula
Image Credit: NASAReflection nebula and emission seem to like to see the same but have somefundamental differences Between themes. Reflection nebula have no element that can emit light but we see the light through the telescope is reflected light of other nearby stars or light-emitting nebula. Its nebula's lack of light emission due to its abundance of dust. But emission nebulas have huge fuel (Hydrogen, Helium, and various ionized gases) for light emission, nearby star when spread the light and ultraviolet rays then hydrogen gas starts producing its own light. Usually, its color is blue because the scattering is more efficient for blue light than red (this is the same scattering process that gives us blue skies and red sunsets). Hubble's Variable Nebula, The Pelican Nebula, NGC 1931, The Dark Lantern Nebula, and NGC 2023 are some reflection nebula.
Dark Nebula
Image Credit: NASAA dark nebula, also known as an absorption nebula, is a type of interstellar cloud containing dense dust particles that block visible light from passing through, making background stars and objects appear hidden or dimmed. It blocks the light of stars and nebulas from behind that's reason we see it as a black object. Another reason dark nebula are not visible is that there tini particle covered by coldest carbon monoxide and nitrogen gas, which affectively block light. Scientists use radio wave or infrared wave to find obscure light that hide by dark object. B33, LDN 125, Branard 68, B 168, LDN, 183 are some famous dark nebula.
Supernovae Remnant
Supernova remnants is dust and gases layer formed after of cosmic explosion of a star. This explosion occurs due to the core damage of the star.Supernova Remnants:
Image Credit: NASAFormation and Characteristics
A supernova explosion generates a powerful shock wave in space, which collides withinterstellar materials (various gases, metals, and dust). This collision forms a large,circular (or sometimes irregular) gaseous shell. During this stage, the temperature canrange from 1 to 100 million Kelvin. Over time, it gradually cools down to about a fewthousand Kelvin. The debris from the supernova provides essential materials for theformation of new stars or planets in the future. The plasma and shock waves within thesupernova remnant create a strong magnetic field. If a neutron star exists at the centerof the supernova, its intense gravitational pull controls the surrounding gaseousring.Scientists observe these supernova remnants using radio telescopes or infraredtelescopes, offering deeper insights into such phenomena.Some supernova remnants1. Crab Nebula (M1) 2. Cassiopeia A (Cas A) 3. Tycho's Supernova (SN 1572) 4. VeilNebula 5. RCW 86
Nebulae formed from various cosmic materials are a significant means ofunderstanding space in depth.It informs us about the nature and activities of space. While the radiant glow of nebulae mesmerizes us, it offers even greater insights into cosmology
