What is the density of nebula?

The densest nebulae can have densities of 10,000 molecules per cubic centimeter (or sometimes even more). The coolest nebulae can have temperatures of T = 10 Kelvin (or even less).

How much mass is in a nebula?

Forms and structure. Compared with diffuse nebulae (see H II region), planetary nebulae are small objects, having a radius typically of 1 light-year and containing a mass of gas of about 0.3 solar mass.

What is the chemical composition of nebula?

The chemical composition of ionized nebulae is generally determined from the strong forbidden lines of different ions of oxygen, nitrogen, sulfur, and chlorine, which are compared to the strong recombination lines of hydrogen.

How is planetary nebula formed?

A planetary nebula is created when a star blows off its outer layers after it has run out of fuel to burn. These outer layers of gas expand into space, forming a nebula which is often the shape of a ring or bubble.

What is a white star?

1 : a star of spectral type A or F having a moderate surface temperature and a white or yellowish color. 2a : an annual morning glory (Ipomoea lacunosa) of the southern U.S. with star-shaped leaves and small white or purplish flowers. b : a bellflower (Campanula carpatica alba) with white flowers.

How many nebula are there?

Right now, we know of about 3,000 planetary nebulae in our galaxy, the Milky Way, out of roughly 200 billion stars. Most of them are near the center of our galaxy. They come in many shapes, but most are spherical, elliptical, or bipolar.

What are the 4 types of nebulae?

There are five types of cloudy or nebulous objects in the sky: planetary nebulae, emission nebulae, reflection nebulae, dark nebulae and supernova remnants. I will cover the planetaries in the next chapter and discuss the other four types here.

What gases are in a nebula?

The roots of the word come from Latin nebula, which means a “mist, vapor, fog, smoke, exhalation.” Nebulae are made up of dust, basic elements such as hydrogen and other ionized gases. They either form through clouds of cold interstellar gas and dust or through the aftermath of a supernova.

What shape is a nebula?

New research shows why planetary nebulae range in shape from spirals to butterflies. Planetary nebulae are like a box of chocolates: You never know what you’re going to get.

Who found the first nebula?

The first planetary nebula to be discovered was the Dumbbell Nebula, M27, by Charles Messier in 1764. He eventually added four to his catalog of astronomical objects.

How big is the density of a Nebula?

Nebulae is too nebulous a term to provide a specific answer since it basically includes almost all extended Galactic gas and dust structures. The density of the interstellar medium ranges from below 1 particle c m − 3 to about 10 6 cm − 3.

What kind of gas is the Nebula Gas?

Nebula Gas. The Nebula Gas (ネビュラガス, Nebyura Gasu) is a type of gas from the crack of the Sky Wall. Faust is able to change people into monsters by injecting a concentrated formula of the Gas in liquid form into a test subject or using Fullbottles of their own for their agents.

What causes a nebula to shine in space?

The venting of atmosphere continues unabated into interstellar space, but when the outer surface of the exposed core reaches temperatures exceeding about 30,000 K, there are enough emitted ultraviolet photons to ionize the ejected atmosphere, causing the gas to shine as a planetary nebula.

What makes a planetary nebula a forbidden line?

These spectral lines, which can only be seen in very low density gases, are called forbidden lines. Spectroscopic observations thus showed that nebulae were made of extremely rarefied gas. Planetary nebula NGC 3699 is distinguished by an irregular mottled appearance and a dark rift.