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Nebulae
A nebula refers to an interstellar cloud of dust, helium gas, hydrogen gas, and other ionized gases in outer space. There are several types of nebulae categorized according to how they were formed.
410 Questions
What is the composition of nebula?
A solar nebula is made of (roughly) the same chemical composition as a star, namely:
70% Hydrogen
28% Helium
2% random molecules, for example Carbon-12 and Lithium.
In the milky way the most abundant gas in emission nebulae is?
The most abundant gas in emission nebulae in the Milky Way is hydrogen. Emission nebulae are commonly made up of ionized hydrogen gas that emits light as it recombines with electrons. This creates the vibrant pink and red colors often seen in these nebulae.
What is the temperature of planetary nebulae?
Planetary nebulae have temperatures that can range from about 10,000 to 30,000 degrees Celsius. This high temperature is due to the intense ultraviolet radiation emitted by the central white dwarf star that ionizes and heats up the surrounding gas and dust, causing it to glow brightly.
Why do nebulae look deifferent?
Nebulae look different because they are made up of different elements, gases, and dust particles. The varying composition and density within each nebula result in different colors, shapes, and structures. Factors such as temperature, age, and the presence of stars also contribute to these differences in appearance.
Nebulae can last for millions to billions of years, depending on their size and composition. Some may dissipate relatively quickly, while others can persist for vast cosmic timescales. The life span of a nebula is largely determined by the processes of star formation and stellar evolution within it.
The nebular model explains how our solar system formed from a rotating cloud of gas and dust called a solar nebula. Gravity caused the nebula to collapse, forming a central protostar surrounded by a spinning disk. Over time, the material in the disk clumped together to form planets and other solar system bodies.
What are the parts of a Nebula?
A nebula typically consists of gas, dust, and plasma. These elements come together in space to form vast clouds of various shapes and sizes. Nebulae are often where new stars are born.
What are the similarities of a galaxy and a nebulae?
Both galaxies and nebulae are large clouds of gas and dust in space. They can both contain regions of star formation and have unique shapes and structures. Additionally, they both play important roles in the formation and evolution of stars and planetary systems.
Ionization nebulae are regions of space filled with ionized gases, where the gas atoms have lost one or more electrons due to being exposed to energetic radiation, such as that emitted by hot stars. This process creates a colorful glow as the ionized atoms recombine with electrons and emit light at various wavelengths, typically seen as red, green, and blue hues in astronomical images. These nebulae are often associated with star formation regions and play a key role in the process of galactic evolution.
The ovary does not have a hole in the traditional sense. It has a small opening called the ovarian hilum through which blood vessels, nerves, and lymphatic vessels enter and exit. This hilum is not a hole like a cavity but rather a point of entry and exit for these structures.
Is the Throne of God in the Orion Nebulae?
The fact is that in the West, many tend to anthropomorphize God, and thus many think of God relative to the limitation of the brain and physical senses. The pure Spiritual realm in which God resides is composed of Neutral Spiritual Energy, and it is not physical at all. Rare are those who have experienced this region, and this is the reason so little is known of it.... and too, nothing in our language actually applies to this realm. But neither God nor His "Throne" would be found in the physical dimension of Creation.
What kind of gases are in nebulae?
Nebulae contain gases such as hydrogen, helium, and trace amounts of heavier elements like carbon, oxygen, and nitrogen. These gases are the building blocks from which stars and planetary systems form. Additionally, other elements and molecules may be present in nebulae, contributing to their varying compositions and colors.
How far away from earth are nebulae?
Nebulae can vary in distance from Earth. Some are close, within a few hundred or thousand light-years, while others can be many thousands or even millions of light-years away. The closest known nebula to Earth is the Helix Nebula, which is about 700 light-years away.
* Galaxy * Nebula * Star * Planet * Moon
However, some moons are larger than planets, and some planets and moons are larger than some stars.
A constellation is an imaginary pattern of stars, so one cannot speak of its actual size.
What is the biggest nebula known?
The Tarantula Nebula, also known as 30 Doradus, is one of the largest and most active star-forming regions in our nearby universe. It is located in the Large Magellanic Cloud galaxy, around 160,000 light years away from Earth. The Tarantula Nebula is roughly 1,000 light years in diameter.
Where are nebulae located in spiral galaxies?
Nebulae are located within the spiral arms of spiral galaxies. These regions are areas of star formation where gas and dust clouds collide and condense, leading to the birth of new stars. The glowing gas and dust of nebulae can be seen as colorful patches within the spiral arms of galaxies like the Milky Way.
"Nebulae" is the plural form of the Latin word "nebula," which means cloud or mist. In astronomy, nebulae refer to massive clouds of gas and dust in outer space.
The Ant Nebula or "Chamber of Horrors" [See Link] can be found in the constellation Norma [See Link]
How nebulae are star factories?
Nebulae are star factories because they are vast clouds of dust and gas in space that can collapse under their own gravitational forces, leading to the formation of new stars. Within nebulae, gas and dust particles come together to form protostars, which eventually evolve into full-fledged stars through the process of nuclear fusion. This ongoing cycle of star formation within nebulae replenishes galaxies with new stars and contributes to the overall creation and evolution of stellar systems.
What is the temperature of a nebulae?
A nebula, in general, is not particularly hot. They are usually visible due to embedded stars.
Are planetary nebulae surrounded by planets?
No, the term planetary nebula is very misleading and it has nothing to do with planets.
A Planetary Nebula forms when stars up to 8 times the mass of our sun reach the end of their lifes (so our sun will form one). Stars heavier than 8 times our sun explode when they die.
After several billion (10 for our Sun) years fusing hydrogen, the star runs out of hydrogen, and there is no longer enough energy flowing out from the core to support the outer layers of the star. The core is thus compressed and heats up. Currently the sun's core has a temperature of approximately 15 million K, but when it runs out of hydrogen, the compression of the core will cause the temperature to rise to about 100 million K. When this happens, the outer layers of the star expand enormously because of the very high temperature of the core, and become much cooler. The core continues to contract and heat up, and when its temperature reaches 100 million K, helium nuclei begin to fuse into carbon and oxygen. The resumption of fusion reactions stops the core's contraction. Helium burning soon forms an inert core of carbon and oxygen, with both a helium-burning shell and a hydrogen-burning shell surrounding it. In this last stage the star will observationally be a red giant.
Helium fusion reactions are extremely temperature sensitive and this means that just a 2% rise in temperature more than doubles the reaction rate. This makes the star very unstable - a small rise in temperature leads to a rapid rise in reaction rates, which releases a lot of energy, increasing the temperature further. The helium-burning layer rapidly expands and therefore cools, which reduces the reaction rate again. Huge pulsations build up, which eventually become large enough to throw off the whole stellar atmosphere into space. The ejected gases form a cloud of material around the now-exposed core of the star. As more and more of the atmosphere moves away from the star, deeper and deeper layers at higher and higher temperatures are exposed. When the exposed surface reaches a temperature of about 30,000K, there are enough ultraviolet photons being emitted to ionize the ejected atmosphere, making it glow. This glowing cloud is a planetary nebula. [Note there may have been planets orbiting the star, the innermost of these will have been destroyed in the reg giant phase but outer planets may still continue to orbit the dying star but these have nothing to do with the planetary nebular].
Nebulae are vast clouds of gas and dust in space, primarily made up of hydrogen and helium. They are formed through the gravitational collapse of gas clouds, often triggered by the explosion of massive stars (supernovae) or by the gravitational interactions between galaxies. As these clouds condense and contract, they can eventually give birth to new stars and planetary systems.
Who proposed the nebular theory?
The nebular theory was proposed by Immanuel Kant and independently by Pierre-Simon Laplace in the 18th century. They suggested that the solar system originated from a rotating cloud of gas and dust called a nebula.
