The Short Answer: A nebula is a giant cloud of dust and gas in space. Some nebulae (more than one nebula) come from the gas and dust thrown out by the explosion of a dying star, such as a supernova. Other nebulae are regions where new stars are beginning to form.

What is nebula and how it is formed?

A nebula is a giant interstellar cloud of dust and hydrogen, helium, and other ionised gases in space. Some of them come when a dying star (such as a supernova) throws out gas and dust due to an explosion. ... The nearest nebula to earth is the Helix Nebula. It is 700 light years away from Earth.

How was nebula born?

Smaller stars like our sun end their lives by ejecting their outer layers of gas into space over the course of about 10,000 years, leaving behind the star's hot core — a white dwarf. Radiation from the white dwarf causes the gas to glow, creating a unique and beautiful formation called a planetary nebula.

How long does it take for a nebula to form?

The expansion velocity of a typical planetary nebula is about 108,000 kilometers per hour (67,108 miles per hour), and one that is 1 light-year across, which is also typical, took about 12,000 years to form.

Is Earth in a nebula?

The Earth was formed from the nebula that produced the Solar System. It is almost universally accepted that the Sun, the planets and their satellites, the asteroids, and the comets of the Oort 'cloud' grew from a cloud of gas and dust that contracted under its own gravity.

How Do Nebulae Form?

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Do nebula turn into galaxies?

A nebula is a cloud of dust and gas, usually tens to hundreds of light years across. A galaxy is much larger — usually thousands to hundreds of thousands of light years across. Nebulae are one of the many things that galaxies are made of, along with stars, black holes, cosmic dust, dark matter and much more.

How is a star born?

Stars are born within the clouds of dust and scattered throughout most galaxies. ... Turbulence deep within these clouds gives rise to knots with sufficient mass that the gas and dust can begin to collapse under its own gravitational attraction. As the cloud collapses, the material at the center begins to heat up.

Is a star bigger than a nebula?

From largest to smallest they are: Universe, galaxy, solar system, star, planet, moon and asteroid.

Can a planetary nebula form a star?

Progenitor stars that form planetary nebulae will spend most of their lifetimes converting their hydrogen into helium in the star's core by nuclear fusion at about 15 million K. ... Such higher core temperatures then make the star's cooler outer layers expand to create much larger red giant stars.

How hot is a nebula?

The temperature of the gas in the nebula is about 10,000 degrees Celsius, and the central stars of planetary nebulae are among the hottest stars in the Universe, with temperature in the range of 25,000 to over 200,000 degrees Celsius.

What causes dark nebula?

Dark nebulae are interstellar clouds that contain a very high concentration of dust. This allows them to scatter and absorb all incident optical light, making them completely opaque at visible wavelengths.

How many nebulae have been discovered?

There are believed to be about 20,000 objects called planetary nebulae in the Milky Way Galaxy, each representing gas expelled relatively recently from a central star very late in its evolution. Because of the obscuration of dust in the Galaxy, only about 1,800 planetary nebulae have been cataloged.

How are black holes formed?

Most black holes form from the remnants of a large star that dies in a supernova explosion. (Smaller stars become dense neutron stars, which are not massive enough to trap light.)

How are planets formed?

Planets form from particles in a disk of gas and dust, colliding and sticking together as they orbit the star. The planets nearest to the star tend to be rockier because the star's wind blows away their gases and because they are made of heavier materials attracted by the star's gravity.

Will the Sun become a nebula?

Ultimately, most scientists believe that the Sun will become a planetary nebula. As is progresses though the red giant stage, the outer envelope of the Sun will be blown off into space. ... After it expels its outer layers, the core of the Sun will contract, and it will become a white dwarf.

What is the difference between nebula and planetary nebula?

A nebula refers to clouds of dust and gas that lie between stars, in so-called interstellar space. A planetary nebula is a special type of nebula made when the outer layers of an old, giant star are thrown off into space.

Is there fusion in a nebula?

These clouds are called nebulae, and it is in a nebula where stars are born. In the nebula is hydrogen gas which is pulled together by gravity and starts to spin faster. ... Once the temperature reaches 15,000,000 degrees Celsius, nuclear fusion takes place in the center, or core, of the cloud.

Is Milky Way a nebula?

The Milky Way is a spiral galaxy that is 70,000 to 100,000 light-years across [source: NASA]. Nebulae are found inside galaxies, filling the space between stars or enveloping stars like a cloak. They're made of dust and gas and can appear as either bright or dark clouds.

Why are nebulae so colorful?

The process is similar to that of a neon light. This causes the nebula to glow. Emission nebulae tend to be red in color because of the abundance of hydrogen. Additional colors, such as blue and green, can be produced by the atoms of other elements, but hydrogen is almost always the most abundant.

What is the name of the galaxy Earth belongs to?

Earth is in the second largest galaxy of the Local Group - a galaxy called the Milky Way. The Milky Way is a large spiral galaxy. Earth is located in one of the spiral arms of the Milky Way (called the Orion Arm) which lies about two-thirds of the way out from the center of the Galaxy.

What is star death?

When a star like the Sun has burned all of its hydrogen fuel, it expands to become a red giant. ... This may be millions of kilometres across - big enough to swallow the planets Mercury and Venus. After puffing off its outer layers, the star collapses to form a very dense white dwarf.

How old is the universe?

Using data from the Planck space observatory, they found the universe to be approximately 13.8 billion years old.

Why are nebulae called star nurseries?

Named after the Latin word for “cloud”, nebulae are not only massive clouds of dust, hydrogen and helium gas, and plasma; they are also often “stellar nurseries” – i.e. the place where stars are born. And for centuries, distant galaxies were often mistaken for these massive clouds.