Answer: A star forms in a huge cloud of gas and dust. Over time, gravity causes the cloud to contract. As the gas becomes denser, the pressure and temperature increase. As the cloud pulls in more gas and dust, its mass, pressure, and temperature continue to increase until nuclear fusion begins.

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In this way, what causes dust and gas to collect in the center?

A star is formed when a cloud of gas and dust in space has enough mass that the gravity from that mass pulls the material of that cloud to a central point rather than the particles of gas and dust escaping by their own velocity.

One may also ask, what caused the cloud to collapse? When the force of gravity pulling in on the cloud is greater than the strength of internal pressure pushing out, the cloud collapses into a protostar.

Keeping this in view, what is the source of the dust and gas found in interstellar clouds?

Most of this interstellar gas and dust originates from the death of stars which either exploded (supernova) or blew off their outer layers, returning their material to interstellar space. From this material, new stars are formed. Often, the gas and dust between the stars can be detected only in the infrared.

What is a cloud of dust and gas?

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. A nebula is a giant cloud of dust and gas in space.

Related Question Answers

What is the last stage of a star's life?

Heavy stars turn into supernovae, neutron stars and black holes whereas average stars like the sun end life as a white dwarf surrounded by a disappearing planetary nebula. All stars, however, follow roughly the same basic seven-stage life cycle, starting as a gas cloud and ending as a star remnant.

What are the three end stages of stars?

The expanding star is now called a Red Giant. Stage 8 - The helium core runs out, and the outer layers drift of away from the core as a gaseous shell, this gas that surrounds the core is called a Planetary Nebula. Stage 9 - The remaining core (thats 80% of the original star) is now in its final stages.

What is the difference between a protostar and a nebula?

Key Difference: Nebula is a cloud in deep space consisting of gas or dirt/dust (e.g. cloud formed after a star explodes). Before the last sequence, a star has large amount of clouds of hydrogen, helium and dust, which is known as a protostar. Nebula forms a protostar. Protostar is the earliest stage of a star.

What color is a protostar?

A protostar with less than 0.08 solar masses never reaches the 10 million K temperature needed for efficient hydrogen fusion. These result in “failed stars” called brown dwarfs which radiate mainly in the infrared and look deep red in color.

Is the sun a protostar?

The young protostar was a ball of hydrogen and helium not yet powered by fusion. Over tens of millions of years, the temperature and pressure of the material inside increased, jumpstarting the fusion of hydrogen that drives the sun today. The sun is an average-size star, not too big and not too small.

What is the relationship between mass and the lifespan of a star?

The stars mass (once it becomes a star) is inversely proportional to its lifetime as a main sequence star. A red dwarf can survive for many billions of years; a star that has twice the mass of the Sun, such as Sirius A, will have 25% of the Suns lifetime.

What is in a protostar?

A protostar is a very young star that is still gathering mass from its parent molecular cloud. It ends when the infalling gas is depleted, leaving a pre-main-sequence star, which contracts to later become a main-sequence star at the onset of hydrogen fusion.

What comes first nebula or protostar?

A nebula can be many light years across. It is in these nebulae that dust and gas can come together to form stars. A star is not truly a star until it can fuse hydrogen into helium. A protostar is formed as gravity begins to pull the gases together into a ball.

Are we in a nebula?

1 Answer. This depends a lot on exactly how you define a nebulae, but we are actually in a very dense region of the interstellar medium, the local interstellar cloud. Observing it directly from Earth is very difficult, due to sunlight and the solar wind, but its magnetic field has been measured by the Voyager 2 probe.

Do nebulas move?

Do nebulae move? They do move, but you don't notice it because they are astoundingly, mindbogglingly HUGE, and even fast-moving parts take months and years to show even slight changes.

How old is a nebula?

Now we estimate its distance from us as somewhere around 1500 light years. This in turn puts our calculation of the distance it has expanded at a lower number (90 light years instead of 150), and thus dropped the estimated age of the nebula from 20,000 years to somewhere between 5000-8000 years old!

What are the two types of Nebula?

Types of Nebulae
  • Galaxies.
  • Globular Clusters.
  • Open Clusters.
  • Emission Nebulae.
  • Reflection Nebulae.
  • Dark Nebulae.
  • Planetary Nebulae.
  • Supernova Remnants.

Is there gas in outer space?

Additional Gases in SpaceWhile hydrogen and helium make up most of the gases in interstellar space, tiny traces of other elements such as carbon, oxygen and iron also exist. Scientists who study interstellar space use spectrometers to identify trace amounts of other molecules between the stars.

Is a nebula bigger than a galaxy?

Nebula is a cloud of interstellar dust, while galaxy is a huge collection of stars. Size of a galaxy is much larger than size of a nebula. Life of several stars is connected to life of a galaxy while life of only one star is associated with a nebula. Galaxies can be found in clusters in space.

What is nebula made of?

A nebula (Latin for 'cloud' or 'fog'; pl. nebulae, nebulæ or nebulas) is an interstellar cloud of dust, hydrogen, helium and other ionized gases. Originally, the term was used to describe any diffuse astronomical object, including galaxies beyond the Milky Way.

What happens to light passing through even thin clouds of dust?

When light from other stars passes through the dust, a few things can happen. If the dust is thick enough, the light will be completely blocked, leading to dark areas. These dark clouds are known as dark nebulae. The Horsehead Nebula, seen to the left, is an example of this.

What is the nebular theory?

The nebular theory is an explanation for the formation of solar systems. The word “nebula” is Latin for “cloud,” and according to the explanation, stars are born from clouds of interstellar gas and dust.

What causes a star to die?

A star collapses when the fuel is used up and the energy flow from the core of the star stops. Nuclear reactions outside the core cause the dying star to expand outward in the "red giant" phase before it begins its inevitable collapse. If the star is about the same mass as the Sun, it will turn into a white dwarf star.

Do stars move?

The stars move along with fantastic speeds, but they are so far away that it takes a long time for their motion to be visible to us. You can understand this by moving your finger in front of your eyes. Even when you move it very slowly, it may appear to move faster than a speeding jet that is many miles away.