What do nebulae created - ygg

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And eventually, and with enough gravitational attraction between clouds, this matter can coalesce and collapse to forms stars and planetary systems. In essence, a nebula is formed when portions of the interstellar medium undergo gravitational collapse.

Mutual gravitational attraction causes matter to clump together, forming regions of greater and greater density. Most nebulae are vast in size, measuring up to hundreds of light years in diameter. Although denser than the space surrounding them, most nebulae are far less dense than any vacuum created in an Earthen environment. In fact, a nebular cloud that was similar in size to Earth would only so much material that its mass would be only a few kilograms.

Stellar objects that can be called Nebula come in four major classes. Most fall into the category of Diffuse Nebulae , which means they have no well-defined boundaries.

Emission Nebulae are those that emit spectral line radiation from ionized gas, and are often called HII regions because they are largely composed of ionized hydrogen. In contrast, Reflection Nebulae do not emit significant amounts of visible light, but are still luminous because they reflect the light from nearby stars.

There are also what is known as Dark Nebulae , opaque clouds that do not emit visible radiation and are not illuminated by stars, but block light from luminous objects behind them. Much like Emission and Reflection Nebulae, Dark Nebulae are sources of infrared emissions, chiefly due to the presence of dust within them. Some nebulae are formed as the result of supernova explosions, and are hence classified as a Supernova Remnant Nebulae.

In this case, short-lived stars experience implosion in their cores and blow off their external layers. Other nebulae may form as Planetary Nebulae , which involves a low-mass star entering the final stage of its life. In this scenario, stars enter their Red Giant phase, slowly losing their outer layers due to helium flashes in their interior.

They can be seen among spiral arms in our galaxy. Reflection Nebulae are the ones that reflect light from the neighboring stars. Emission Nebulae is associated with diffuse nebulae. Supernovas are nebulae made of gaseous leftovers ejected when the supernova exploded.

The most known ones are Orion, Horsehead, Crab, and Ring nebulae. Some of them are not visible to the naked eye and need infrared or professional cameras to be seen. The nearest nebula to Earth is light-years away, and it is called the "Helix Nebula.

Nebula comes from the Latin word "cloud. A nebula weighs as much as a cat. Nebulae Nebulas are very important "clouds" in interstellar space. What is a Nebula? How do the Nebulae Form? Why are Nebulae Important? Fun Facts About Nebulas - The almighty Sun was created in a nebula, the solar nebula, and it is believed that in 5 billion years from now, the Sun itself will become a nebula.

What is the Smallest Nebula? Are we Inside a Nebula? What Does a Nebula do? Are Nebulae Dangerous? Nebulae Notes - Nebulas are made of hydrogen, helium, dust, and plasma - Planetary systems and stars are made from dust and gas inside nebulae. Astronomers are drawn to study these objects because they provide opportunities to analyze material that was once a part of a shining star.

For example, by studying the chemical composition of the nebula we can gain an understanding about the material out of which the star originally formed. In addition, the abundances of certain elements such as carbon and nitrogen in the nebula reveal details about the physical processes that occurred within the star during its nuclear fusion lifetime.

Studying planetary nebulae helps us to understand how a star changes, or evolves, during its lifetime. But why and how does a planetary nebula form in the first place? Nebulae have varying compositions depending on how they were formed and where they are. Examples of nebulae I have photographed from my backyard. Nebulae usually consist of Hydrogen and Helium, as these are the most common and stable compounds in the Universe.

The formation of a nebula can occur when a star undergoes a significant change, such as excess fusion in its core. In the case of a planetary nebula, the formation of this deep sky object occurs when a white dwarf star explodes during a supernova. The explosion sends interstellar materials into space that can eventually form into a nebula. Stellar objects that can be called Nebula come in four major classes. Most fall into the category of Diffuse Nebulae, which means they have no well-defined boundaries.

In these star-forming regions, the formations of gas, dust, and other materials cluster together to forming denser regions. The density attracts matter and eventually becoming dense enough to create the formation of stars. The remaining material is then believed to form planets and other planetary system objects. Emission Nebulae are those that emit radiation from ionized gas and are often called HII regions because they are largely composed of ionized hydrogen.

The Orion Nebula is an emission nebula and star-forming region. Not only is it the brightest nebula in our sky, but it is also the most active star-forming region in our Galaxy. This nebula can easily be observed up-close with a small telescope. It occupies an area that is twice the diameter of our full Moon. As gravity continues to merge these materials together, the region becomes hot enough to create a new star.

The remaining materials may form into Planets that will orbit the star, just as our Solar System was formed. It is the most active star-forming region in our Galaxy, and can easily be observed up-close with a small telescope. When early astronomers observed these round, compact nebulae in the night sky — they thought that they must be planets.