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.

1,548 Questions
Planetary Science

How big is the helix nebula compared to earth?

The Helix Nebula, or NGC 7293, is 30,000,000,000,000 kilometers, while Earth is just 12,756.32 kilometers.


What is A cloud of interstellar gas or dust?

solar nebula

Space Travel and Exploration

What do you call a cloud of dust and gas in space?

A clouds of dust and gas in space is called a nebula. Nebula sometimes turn into stars under the right conditions. There are many different classifications give to nebulas. These include ring, emission, reflection and dark nebulae.


Why do emission nebulae appear red when they surround blue stars?

The color of emission nebulae is a result of the predominate gas or gasses in that nebulae. Different gasses glow in different colors. Blue, as the color of the star, indicates how hot the star is.


What is a Nebula?

Nebula means "Cloud" in Latin.

A nebula is an interstellar cloud of hydrogen, helium, plasma and dust. They are often called "stellar nurseries" because stars are "born" within them.

There are many types of Nebula, some stars have nebula's around them when they approach the final stages of their lives as in Wolf Rayet stars.

Diffuse nebula which are nebula which have no defining shape or boundary.

Dark nebula are so dense that it obscures the light from the background

(Such as the Horsehead Nebula),

or that it blocks out background stars

(Such as the Coalsack Nebula).

Reflection nebula are clouds of dust which are simply reflecting the light of a nearby star or stars. Such as the Witch Head Nebula.

Emission nebula is a cloud of ionized gas (plasma) emitting light of various colors. Such as the Eagle nebula.

Planetary nebula which forms from the shells of stars when they transform into white dwarfs. Such as the Cats Eye Nebula

Protoplanetary nebula which is formed from the rapid creation of a star via stellar evolution. Such as the Egg Nebula

Supernova remnants, the remains of a massive star when it explodes in a supernova explosion The resulting expanding shell of gas creates a diffuse nebula. Such as the Crab Nebula.


Where are the ionization nebulae predominantly located?

within or on the edges of the spiral arms of the galaxy


What two things are needed to create an emission nebulae?

hot stars and interstellar gas, particularly hydrogen


What is a diffuse nebulae?

In astronomy, diffuse nebulae is the general term for illuminated nebulae. The three types of diffuse nebulae are reflection nebulae, emission nebulae and supernova remnants. They are diffuse as opposed to the non-diffuse dark nebulae, i.e. the particles have spread out.


What galaxies are sometimes shaped like footballs?

I think elliptical galaxies are the galaxies you are referring to. Scientist normally describe them as a flatted disk shape. These galaxies contain mainly older stars.


How did the crab pulsar get its name?

The Crab Nebula, of which the Crab Pulsar is a part of, got its name in 1840 when the William Parsons, made a drawing of the nebula that he thought looked like a crab.

Pretty simple if you think about it.


What is the crab nebula?

from sci-tech encyclopedia The Crab Nebula is the remnant of a tremendous stellar explosion witnessed by Chinese astronomers in 1054. The explosion, called a supernova, occurred at a distance of about 2000 parsecs from the Earth (1 parsec = 1.9 × 1013 mi = 3.1 × 1013 km = 3.26 light-years). The Crab now consists of three components. At the heart of the nebula is what is left of the core of the Crab's giant stellar progenitor. This neutron star has twice the mass of the Sun concentrated into an object only about 20 km (12 mi) across, giving it a density of 109 tons per cubic centimeter. The neutron star is spinning at 30 times a second, whipping its powerful (108 tesla) magnetic field around with it. Radiation formed in this extreme environment is concentrated into two intense beams directed away from the neutron star's two magnetic poles. As these beams sweep past the direction of the Earth like the beam from a lighthouse, the star appears to wink on and off, earning it the name "pulsar." The Crab pulsar has been seen in all parts of the electromagnetic spectrum from gamma rays through radio waves. The Crab pulsar's rotational period is slowing by 34 nanoseconds a day, and as it slows it loses 100,000 times more power than is radiated away by the Sun. Most of this energy is carried away from the pulsar by a wind of electrons and positrons moving at close to the speed of light. The wind feeds a vast cloud of highly relativistic particles. This cloud is called the Crab synchrotron nebula because, as the particles spiral through the nebula's magnetic field, they give off the sort of radiation emitted by a synchroton particle accelerator. . The third component of the Crab is a complex of filaments made up of gas ejected by the explosion itself (see illustration). The filaments are ionized by ultraviolet radiation from the synchrotron nebula, causing them to glow like the gas in a fluorescent light bulb

Oral Health and Dental Care

How long does it take for a tooth cavity to form?

The formation of a cavity depends of: 1- How much sugar is in the diet.

2- The person's hygiene.

3- The person's defense system. If a person has a low defense system in his mouth, has a poor diet and poor hygiene, a cavity can form within a few weeks.


Are there any galaxies nebulae or meteor showers found in Aquarius?

There are galaxies and nebula in every direction, including Aquarius.


How long does it take for osteophytes to form?

Ostiophytes can be caused by many different problems in many different parts of the body. however they usually take some years to form and become a problem.

Bone spurs form due to the increase in a damaged joint's surface area. This is most commonly from the onset of arthritis. Bone spurs usually limit joint movement and typically cause pain.

Bone spurs form naturally on the back of spine as a person ages and are a sign of degeneration in the spine. In this case the spurs are not the source of back pains, but instead are the common symptom of a deeper problem. However, bone spurs on the spine can impinge on nerves that leave the spine for other parts of the body. This impingement can cause pain in both upper and lower limbs and a numbness or tingling sensations in the hands and feet due to the nerves supplying sensation to their dermatomes.

Spurs can also appear on the feet, either along toes or the heel, as well as on the hands. In extreme cases bone spurs have grown along a person's entire skeletal structure: along the knees, hips, shoulders, ribs, arms and ankles. Such cases are only exhibited with multiple exostoses.

Osteophytes on the fingers or toes are known as Heberden's nodes (if on the DIP joint) or Bouchard's nodes (if on the PIP joints).

Bone spurs may also be the end result of certain disease processes. Osteomyelitis, a bone infection, may leave the adjacent bone with a spur formation. Charcot foot, the neuropathic breakdown of the feet seen primarily in diabetics, will also leave bone spurs which may then become symptomatic.

Osteophyte formation has been classically related to any sequential and consequential changes in bone formation due to aging, degeneration, mechanical instability, and disease. Often osteophytes form in osteoarthritic joints due to damage and wear from inflammation. Calcification and new bone formation can also occur in response to mechanical damage in joints, or at the attachment points for ligaments and tendons.( this is an article sourced from Wikipedia)


How did Judaism diffuse?

Judaism/Israelite Religion did not diffuse outside of the southern Levant until the Babylonian Exile period when the elite from Judea were deported to Babylon. It became a rather large community there before returning to the southern Levant under the permission of King Cyrus of Persia. During the Persian and Hellenic Greek Periods, Judaism remained a Middle Eastern religion. When the Romans exiled the Jews from Judea after the Zealot Revolts and the Bar Kochba Revolts, Jews were scattered to all of the corners of the Roman Empire.

In the post-Roman Empire period, Jews migrated from country to country whenever they were exiled or offered much better opportunities elsewhere. In this way, Jews diffused into many different European and Arab societies, as well as becoming a small part of India and China and later the New World.

Planetary Science

How far is the Horsehead Nebula?

The Horsehead Nebula (also Barnard 33) is a dark nebula in the constellation Orion

It is approximately 1,500 light years from us.


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.


Can there be lightning in space?

no there can not be lightning in space cause theres nothing for it to hit when it strikesAnswer #2: Yes, lightning can happen in space. However, it will not be like planet-based lightning. Astronomers have found discharges of extremely high current in various parts of space with currents millions of times that of lightning found on Earth and "bolts" sizing in the dozens of parsecs in length formed by the discharge of a black hole's electromagnetic field.

Additionally, lightning happens inside nebulae due to stars ionizing the gas in the nebula (Which incidentally causes the colorization). Gamma ray bursts can also cause large discharges.


How long does it take for marble to form naturally?

Millions of years.


The names of the two well-known nebulae?

Andromeda, Milky Way

These are galaxies ^

Orion Nebula

Eagle Nebula


Are planetary nebulae sites for planet formation?

No, they are ionized gases thrown off stars near the end of their fusion cycles. They are expanding clouds of matter, quite different from the nebulae in which stars form.


How does the spectrum help us to determine age and distances in the universe?

Age is kind of a mystery to me.

Distance, though...

Spectra show characteristic lines. They indicate the presence of specific elements, and they're always at the same frequency.

Except they're not. Very distant objects show the right pattern of lines, but "shifted" to the red to some amount. Since we know what the lines' frequencies are supposed to be, we can calculate the amount of this "redshift".

The amount of redshift tells us, indirectly, the distance, by comparison to other objects that we can actually measure the distance to using other techniques (redshift is proportional to distance).

This sort of relates to "age" in a way: the further away something is, the longer it took for the light to get to us, and so based on the distance we can calculate that the light we're now seeing must have actually been emitted x million years ago or whatever (physicists are cringing at this sentence, because relativity says there's no such thing as universal time).


What type of nebula is the Stingray Nebula?

The Stingray Nebula (Hen 3-1357) is a planetary nebula. (The youngest known).


How long does it take for a crystal to form?

It could be minutes or hundreds of thousands of years depending on the size of the crystal and the method of formation.


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