Nebulae

if they are massive enough and have sufficient gravitational force to overcome pressure forces and begin the process of nuclear fusion, which powers stars. This collapse is triggered by disturbances such as shock waves from supernovae or gravitational interactions with other clouds.

Gravitational force pulls gas and dust particles together to form a nebula, while the outward pressure from gas particles pushing against each other (thermal pressure) prevents the nebula from collapsing under gravity. These two forces work together to stabilize a nebula.

Nebulae are named based on their appearance, location in the sky, or the discoverer. Common types of nebulae include emission nebulae, reflection nebulae, and planetary nebulae. They are often given informal names that describe their shape or features.

Horsehead Nebula doesn't glow like other nebulae because it is older than other nebulae and was probably a lot smaller. In addition, Horsehead Nebula is farther away from the Earth than other nebulae, so it may seem that it doesn't glow as bright as other nebulae.

No, this isn't right!

The horsehead nebula doesn't glow for one reason - it isn't illuminated by any stars whose energy is enough to make the gas shine. That's the only difference between a 'bright' diffuse nebula (like M42) and a 'dark' one like the Horsehead or the Coalsack. M42 (the Orion nebula) is bright because there are several hot, energetic stars embedded inside it, and which cause it to 'shine'.

A cloud of interstellar gas or dust is a region in space where particles of gas or dust are concentrated. These clouds can vary in size and density and play a crucial role in the formation of stars and planets. They can also give rise to spectacular astronomical phenomena like nebulas.

It is difficult to prove the nebular hypothesis because the formation of solar systems happens over billions of years, making direct observation of the process challenging. Additionally, there is the lack of direct evidence from other forming solar systems to compare with our own. The hypothesis relies on simulations, models, and indirect observations to support its validity.

A star forms a nebula when it runs out of fuel. The star either becomes a red giant or a supergiant, then the star would be blown off into space either by expansion or explosion. The outer layers, which was released into space, would become a nebula, or sometimes a part of a larger nebula.

Multiple nebulas are not needed to create a star. A star forms from the gravitational collapse of a single nebula, a region in space where gas and dust come together. The collapsing nebula undergoes fusion in its core to become a star.

A planetary nebula is a glowing shell of gas and dust formed by a star shedding its outer layers at the end of its life. Despite its name, it has nothing to do with planets. The glowing gas is illuminated by the hot core of the star left behind, known as a white dwarf.

The star that created the Crab nebula exploded in the year 1054

i do know that its a diffuse mass of interstellar dust or gas or both, visible as luminous patches or areas of darkness depending on the way the mass absorbs or reflects incident radiation. Hope that helps. :)

It was first observed by Chinese astronomers in 1054 AD, but given it's (estimated) distance from earth of 3,600 light years, the actual explosion would have taken place 3,600 years earlier, or around 2,500 BC.

Andromeda, Milky Way

These are galaxies ^

Orion Nebula

Eagle Nebula

Two well-known nebulae are the Orion Nebula (Messier 42) and the Crab Nebula (Messier 1). The Orion Nebula is a diffuse cloud in the constellation Orion, visible to the naked eye, while the Crab Nebula is a remnant of a supernova explosion observed in the year 1054.

Gas and dust in interstellar nebulae can form stars and planetary systems through a process called stellar formation. As gravity causes the gas and dust to collapse and condense, they heat up and eventually ignite nuclear fusion, leading to the formation of a star. Planets and other celestial bodies can then form from the leftover material in the nebula.

The main types of nebulae are emission nebulae, reflection nebulae, dark nebulae, and planetary nebulae. Emission nebulae glow with their own light, often due to hydrogen gas being ionized by nearby stars. Reflection nebulae reflect light from nearby stars. Dark nebulae are dense clouds of dust that obscure light. Planetary nebulae are the ejected outer layers of dying stars.

Nebulae glow because they are made up of gas and dust particles that are illuminated by nearby stars. These particles scatter and reflect starlight, creating the glowing appearance. Additionally, some nebulae may also emit light due to processes such as ionization or radiation.

The law of conservation of mass states that matter can never be created or destroyed, only rearranged in space and changed into different forms. Therefore, when a star or other celestial object is destroyed, its matter has to continue existing, and so takes the form of a nebula, a shapeless cloud of gasses, until gravity can pull it into a discernible shape.

The Crab Nebula or M1 has a supernova designation of SN1054 (SN=Supernova) and (1054 was the year is was observed).

It is located about 6,500 light years from us, so it would have exploded about 6,500 years ago - give or take a few hundred years.

There are countless nebulae in space, estimated to number in the billions. They come in various shapes, sizes, and colors, and are often the birthplaces of stars. Some famous examples include the Orion Nebula and the Helix Nebula.

Nebula has features that include network security policies, host identity and encryption. It is designed to be simple to use and deploy, and handles complex networking tasks with ease. Nebula also supports multi-cloud environments and provides visibility and control over network traffic.

An interstellar cloud is a vast region in space that contains gas and dust particles. These clouds can vary in size and density, and serve as the birthplace for new stars. They are also important in the formation and evolution of planetary systems.

Emission nebulae like M42 occur near stars that emit large amounts of ultraviolet radiation. This intense radiation ionizes the surrounding gas, causing it to emit light in various colors, giving rise to the beautiful glowing clouds we observe in such nebulae.

Nebulae have different colors because of the type of gases they contain and the way they interact with surrounding light. Hotter gases tend to emit blue and ultraviolet light, while cooler gases emit red and infrared light. Dust particles can also scatter light, creating different hues in a nebula.