The connection and difference between stars and nebulae

Nebulae are divided into many kinds, and there is no way to explain this problem if it is a general concept.

In terms of morphology, it can be divided into: a vast, thin and amorphous diffuse nebula, a planetary nebula with a bright ring** with a hot core, and a supernova remnant cloud that is still spreading around (see Supernova Remnants).

Diffuse nebulae are not directly related to stars, and may be called emission nebulae because of the star's illumination, or in the background as dark nebulae. Planetary nebulae are the result of the ejection of material from the evolution of a star with a mass similar to the Sun into a white dwarf, and are the remnants of a star in later years.

In terms of luminescent properties, nebulae can be divided into: emitting nebulae that are excited to emit light by high-temperature illuminated stars (earlier than type B1) at or near the center, reflected nebulae that emit light by reflecting and scattering radiation from low-temperature illuminated stars (later than type B1), and dark nebulae that partially or completely block the background stars.

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There are many types of nebulae, and it is difficult to explain them without listing them all.

To put it in general terms, stars and nebulae are two completely different celestial bodies, like fish and birds.

Some nebulae are formed because of stars, and some nebulae are formed unrelated to stars because the light of the stars can be seen.

Isn't that easier to understand? But it's obviously not too rigorous compared to the above.

Supernovae explode into nebulae, and nebulae shrink into stars.

Numerous stars make up a nebula.

Nebulae are interchangeable with stars

No, nebula contains the addition of planets and planetsCometAlmost all outer malleable celestial bodies, made ofInterstellar spaceof gas and dust combine to form a cloud-like celestial body.

The gas ejected by the star will become part of the nebula, and the nebulous matter will be compressed by gravity to become a star. Under certain conditions, nebulae and stars can be converted into each other.

The high-speed rotation forms a super-strong magnetic field that will be a pulsar.

A large number of positive and negative electrons in the surface magnetosphere continue to blow around, forming a powerful star wind with a speed of almost light. When the electrons in the star wind collide with the external medium, they are further accelerated to a higher energy and produce the nebula we see. These nebulae produce a large number of high-energy photons "Liang Na patronizes" the earth.

Because stars are born from nebulae.

When a star dies, most of its material returns to the nebula and becomes the raw material for the next generation of stars. Nebulae and stars together make up galaxies, and celestial bodies such as planets exist on the basis of stars. Therefore, nebulae and stars are the most basic celestial bodies in the universe.

According to gravity, matter revolves around a star or nebula, so it is the most basic celestial body in the universe.

The main difference between stars and stars is their properties such as mass, temperature, brightness, and elemental composition. Here are some of the key differences between stars:

1.Mass: The mass of stars varies from low to high, with smaller stars (such as red dwarfs) typically having masses between the solitary mass and larger Hengpeiqing stars (such as giants or supergiants) ranging from hundreds to thousands of solar masses.

The more massive the star, the higher the pressure and temperature inside, resulting in higher luminosity and surface temperatures.

2.Temperature: The temperature of a star is related to its mass. The more massive the star, the higher the temperature of the core. For example, the temperature of the Sun is about 6000K, while the temperature of a red dwarf is usually between 3000K and 5000K.

3.Brightness: The brightness of a star is related to its mass and surface area. The more massive the star, the smaller its surface area and hence the higher light output per unit area. This means that stars with greater mass are usually brighter.

4.Elemental composition: The nuclear reaction process inside the star produces different types of elements such as hydrogen, helium, carbon, oxygen, etc. The elemental composition of a star is related to its mass. In general, stars with greater mass tend to produce heavier elements such as oxygen, neon, magnesium, etc.

5.Lifespan: The lifespan of a star is related to its mass.

The more massive the star, the faster the nuclear reaction of its core, resulting in a shorter lifespan. For example, a star with a mass of up to the mass of the Sun has a lifetime of about 10 billion years, while a star with a mass of hundreds to thousands of times the mass of the Sun can have a lifetime of only a few million years. Conversely, stars with less mass, such as red dwarfs, can live hundreds of billions of years.

Despite these distinctions between stars, they are both celestial bodies in the universe that produce light and energy through nuclear fusion reactions.

Density, weight, and material are not the same.

1. Different definitions:

1) Nebula contains almost all malleable objects except planets and comets.

2. Different characteristics: Compared with stars, nebulae have the characteristics of large mass, large volume and small density. An average nebula has a mass equivalent to at least a thousand suns and a radius of about 10 light-years.

3. Different classifications:

1) Nebulae can be divided into: emission nebulae, reflection nebulae, dark nebulae, diffuse nebulae, planetary nebulae, supernova remnants, bipolar nebulae, Orion nebulae, Lyra nebulae, etc.

2) Stars can be divided into: solitary stars, fragmentary stars, condensed stars, capture stars, white dwarfs, main-sequence stars, giant stars, supergiant stars, etc.

Compared with stars, nebulae have the characteristics of large mass, large volume and low density.

In terms of volume, the nebula is large.

Ordinary nebulae are light-years in diameter, but stars never do. The larger stars discovered so far are only a few thousand suns in diameter, far less than 1 light-year.

Qualitatively] Nebula is large.

In terms of the relationship between the two, stars are formed from nebulae, and nebulae will also be formed after stars**; But an average nebula has a mass equivalent to at least a thousand suns and a radius of about 10 light-years.

Other parameters] temperature: stellar high, surface temperature at least 1,000 carats;

Radiation: stellar intensity;

Luminosity: Nebulae themselves do not emit light, and luminosity is affected by nearby stars, which is generally lower than that of stars.

Density: Nebulae have a density of about a few tens of atoms per cubic centimeter, which is much smaller than the vacuum in a laboratory; The density of stars varies widely, from some close to a vacuum in a laboratory to several orders of magnitude denser than water.

The simplest illustration: a star is a "point", while a nebula is more like a "face"!

Usually a star is measured in kilometers and a nebula is light-years (1 light-year is about 9,460 billion kilometers).

Stars are spherical or globheroid objects made up of hot gas that emit light on their own. (Additional note: The ancients called them stars that were considered to be fixed and immobile; But in fact, the stars are not really immobile, but because they are so far away from us, it is difficult for the ancients to detect the changes in their position in the sky without the help of special tools and methods; Today, the name "star" is inherited.

There are two types of nebulae: the Hanoi Nebula and the Transgalactic Nebula. (The river refers to our Milky Way).

Let's talk about the extragalactic nebula first: the extragalactic nebula is actually not a nebula, it is a galaxy like our Milky Way, but because it is too far away, when the telescope was not advanced in the past, it was mistaken for a celestial body like the Hanoi nebula, but because it has been conventionally called, it is still called so. For example, the famous Andromeda Nebula.

The Hanoi Nebula is mainly a cloudy object composed of gas and dust, which is a nebula in the true sense of the word.

The distribution of interstellar matter in cosmic space is not uniform. Under the gravitational pull, gas and dust may attract each other and become dense in some places, forming clouds. They are figuratively called "nebulae".

According to the morphology, the Hanoi Nebula can be divided into several types, such as diffuse nebula and planetary nebula.

Our galaxy belongs to a nebula.

A star is a star that heats up, like the Sun.

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Planets, stars, stars, and nebulae are different in 3 ways:

The overviews of the first and fourth are different:

1. Overview of planets: Planets usually refer to celestial bodies that do not emit light on their own and orbit stars.

2. Overview of stars: Stars are spherical luminous plasmas condensed by gravity, and the sun is the closest star to the earth.

3. Overview of stars: Stars refer to celestial bodies in the universe that are visible to the naked eye.

4. Overview of nebulae: Nebulae are one of the celestial bodies composed of thin gas or dust.

The scope of the two and four is different:

1. The range of planets: including Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.

2. Range of stars: There are many types of stars in the universe, and the origin and evolution of different types of stars are different, and stars need to be classified.

3. Range of stars: Stars can be roughly divided into planets, stars, comets, white dwarfs, etc.

4. The scope of the nebula: It includes almost all malleable celestial bodies except planets and comets. Their main component is hydrogen, followed by nitrogen, and also contains a certain proportion of metallic and non-metallic elements.

The characteristics of the three and four are different:

1. Characteristics of planets: Generally speaking, planets need to have a certain mass, and the mass of the planet must be large enough and similar to spherical, and they cannot undergo nuclear fusion reactions like stars.

2. Characteristics of a star: Almost everything about a star depends on its initial mass, including essential characteristics such as luminosity and size, as well as evolution, longevity, and eventual fate.

3. Characteristics of stars: The activity of energy inside the stars makes the stars irregularly shaped. The brighter the star, the smaller it becomes.

4. Characteristics of nebulae: Planetary nebulae look a bit like a smoke ring, the center is empty, and there is often a very bright star. Stars are constantly projecting material outward, forming nebulae.

It can be seen that planetary nebulae are the result of the evolution of stars in their later years. The more famous ones are the Aquarius Ear Wheel Nebula and the Lyra Ring Nebula.

Stars are the general term for all celestial bodies other than Earth that are capable of emitting light. Planets, stars, moons, comets, etc., can all be called stars.

Stars are celestial bodies that emit light and heat on their own. All but a few planets and the moon are all stars (except for cloudy nebulae and occasional comets and meteors). The closest star to us is the Sun that can only be seen during the day.

There are several types of nebulae. One type is the nebula formed when the outer gas leaves the core of the star in the late stage of star evolution, which is called a planetary nebula. It's like a star in the middle, with a circle of misty clouds outside.

One is an expanding irregular cloud created by a star through a supernova explosion, such as a crab nebula. One is the interstellar cloud with a large area in the Milky Way, usually the birthplace of new stars, called the diffuse nebula. There is also a category of galaxies outside the Milky Way, which are sometimes called nebulae because they look like a small cloud of mist, such as the Andromeda Nebula.

1. Different volumes: Ordinary nebulae are light-years in diameter, while stars never do so. The larger stars discovered so far are only a few thousand suns in diameter, far less than 1 light-year.

2. Different masses: Stars are formed from nebulae, and nebulae will also be formed after stars; But a common nebula has the mass of at least a thousand ridges to move a sun, with a radius of about 10 light-years.

3. Different densities: the density of nebulae is about dozens of atoms per cubic centimeter, which is much smaller than the vacuum in the laboratory; The density of stars varies widely, from some close to a vacuum in a laboratory to several orders of magnitude denser than water.