A STAR IS BORN – STAGES COMMON TO ALL STARS
All stars start as a nebula
. A nebula is a large cloud of gas and dust. Gravity can pull some of the gas and dust in a nebula together. The contracting cloud is then called a protostar.
How do All stars start?
All stars begin their lives
from the collapse of material in a giant molecular cloud
. These clouds are clouds that form between the stars and consist primarily of molecular gas and dust. Turbulence within the cloud causes knots to form which can then collapse under it’s own gravitational attraction.
When in a star’s life cycle is it called a nebula?
At 200,000,000 °C the helium atoms in the core fuse to form carbon atoms. The last of the hydrogen gas in the outer shell is blown away to form a ring around the core. This ring is called a
planetary nebula
. When the last of the helium atoms in the core are fused into carbon atoms, the medium size star begins to die.
Is a nebula the birth of a star?
Star Formation
Stars are born within the clouds of dust and scattered throughout most galaxies
. A familiar example of such as a dust cloud is the Orion Nebula. 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.
What are the stages in the formation of a star from a nebula?
Stage 1- Stars are born in a region of high density Nebula, and condenses into a huge globule of gas and dust and contracts under its own gravity. This image shows the Orion Nebula or M42 . Stage 2 – A region of condensing matter will begin to heat up and start to glow forming Protostars.
Do stars have a life cycle?
Much like any living being,
stars go through a natural cycle
. This begins with birth, extends through a lifespan characterized by change and growth, and ends in death. Of course, we’re talking about stars here, and the way they’re born, live and die is completely different from any life form we are familiar with.
How does a nebula turn into a main sequence star?
A star is born when the gas and dust from a nebula become so hot and dense that hydrogen atoms are smashed together to form helium. This process, called
nuclear fusion
, occurs in every star and produces energy. It is now known as a main sequence star.
How do stars end their life cycle?
The events at the end of a star’s life depend on its mass. Really massive stars use up their hydrogen fuel quickly, but are hot enough to fuse heavier elements such as helium and carbon. Once there is no fuel left, the star collapses and the outer layers explode as a ‘supernova’.
Can a star become a planet?
Yes, a star can turn into a planet
, but this transformation only happens for a very particular type of star known as a brown dwarf. Some scientists do not consider brown dwarfs to be true stars because they do not have enough mass to ignite the nuclear fusion of ordinary hydrogen.
What is the main sequence stage of a star’s life cycle?
When the stars go out
Eventually,
a main sequence star burns through the hydrogen in its core, reaching the end of its life cycle
. At this point, it leaves the main sequence. Stars smaller than a quarter the mass of the sun collapse directly into white dwarfs.
What force helps a star begin to form?
gravity
is the force responsible for the formation of a star.
Who discovered the life cycle of a star?
During the 1920s, based on the principles of quantum mechanics, British physicist
Ralph H. Fowler
determined that, in contrast to the predictions of Russell, a white dwarf would become smaller as its mass increased.
Is nebula a galaxy?
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.
Are we in a nebula?
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.
Can planets exist in a nebula?
The answer would be yes. As the planet orbits its star that orbits the center of the galaxy, the planet and its star could enter a nebula and pass through that nebula for thousands or millions of years and then emerge on the other side of the nebula.
What are the 7 stages of star formation?
- STAGE 1: AN INTERSTELLAR CLOUD.
- STAGE 2: A COLLAPSING CLOUD FRAGMENT.
- STAGE 3: FRAGMENTATION CEASES.
- STAGE 4: A PROTOSTAR.
- STAGE 5: PROTOSTELLAR EVOLUTION.
- STAGE 6: A NEWBORN STAR.
- STAGE 7: THE MAIN SEQUENCE AT LAST.
What are the 7 stages of star?
- A nebula. A star forms from massive clouds of dust and gas in space, also known as a nebula. …
- Protostar. As the mass falls together it gets hot. …
- Main sequence star. …
- Red giant star. …
- White dwarf. …
- Supernova. …
- Neutron star or black hole.
During which stages of a star’s life is the star in hydrostatic equilibrium?
During the
Main Sequence phase
, core hydrogen fusion creates the pressure (in the form of radiation pressure and thermal pressure) that maintains hydrostatic equilibrium in a star, so you should expect that when a star’s core has become filled with helium and inert, the star will fall out of equilibrium.
How long is the life cycle of a star?
Scientific Background for Life Cycle of Stars. Go back to Lesson. Because stellar lifetimes range from perhaps
40,000 years to longer than 10 billion years
, astronomers never get to watch a particular star go through all of its life cycle phases.
What is meant by planetary nebula?
planetary nebula,
any of a class of bright nebulae that are expanding shells of luminous gas expelled by dying stars
.
What makes a star a main sequence star?
Definition of a Main Sequence Star
A main sequence star is any star that is
fusing hydrogen in its core and has a stable balance of outward pressure from core nuclear fusion and gravitational forces pushing inward
.
How are nebulae and stars Related quizlet?
–
A nebula is an accumulation of dust and gas (a cloud) that is sometimes visible in the night and eventually collapses on itself creating a star
. – The other way this type of nebula is formed is when a white dwarf star accretes material from other nearby stars.
What force causes a nebula to form a protostar?
How is a Protostar Formed? Inside a nebula, there are areas where gravity causes dust and gas to “clump” together. As these “clumps” gather more and more mass their
gravitational pull
increases, forcing more atoms together. This process is known as accretion, and the result is a protostar.
What is star death called?
While most stars quietly fade away, the supergiants destroy themselves in a huge explosion, called
a supernova
.
What are the 6 stages of a star?- Pic of 4th stage. The star reaches equilibrium it can last up to 10 billion years.
- The 2nd stage. A region of condensing matter will start to heat up and become a Protostar.
- The 1st stage of a stars life cycle. …
- The 3rd stage. …
- The 4th stage. …
- Pic of 3rd stage. …
- The 4th stage.
What does a star turn into when it dies?
After puffing off its outer layers, the star collapses to form
a very dense white dwarf
. One teaspoon of material from a white dwarf would weigh up to 100 tonnes. Over billions of years, the white dwarf cools and becomes invisible. Stars heavier than eight times the mass of the Sun end their lives very suddenly.
