Life of stars
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Stars are formed from dense nebulae that contract under gravity. They shine by nuclear fusion of hydrogen into helium. Small stars with about one solar mass spend 10 billion years fusing hydrogen, then shed their outer layers and leave behind a cooling white dwarf remnant. More massive stars over 10 solar masses also fuse hydrogen but rapidly become red supergiants and end in supernova explosions, with their cores potentially surviving as neutron stars or black holes.
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Life of stars
The document describes the life cycles of stars from their beginnings as stellar nebulae to their eventual ends as white dwarfs, neutron stars, or black holes. It explains that small stars begin as clouds of dust and gas that collapse under gravity to form stellar nebulae and eventually main sequence stars. As they age, small stars expand into red giants and later planetary nebulae, eventually shrinking down into white dwarfs. More massive stars follow similar stages until reaching their massive ends as red supergiants, supernovae, and neutron stars or black holes.
Planetary nebulae formation
Planetary nebulae form during the late stages of evolution for low-to-medium mass stars. As a star expands into a red giant, it ejects its outer layers through pulsations and stellar winds. The hot core ionizes the ejected gas, causing it to glow brightly. This energized shell of nebulous gas appears as a planetary nebula. Examples are the Helix Nebula and Ring Nebula. More massive stars may explode as supernovae, leaving behind neutron stars or black holes, depending on the star's original mass. The document discusses these stages of stellar evolution and death that give rise to different astronomical phenomena like planetary nebulae and neutron stars.
The life and death of stars
All stars begin as clouds of dust that collapse and form heated cores. As stars reach the end of their lives, they can become white dwarfs after releasing all their energy in the red giant and planetary nebula phases. Alternatively, if a star's internal pressure can no longer counter its own gravity, it may explode as a supernova. The final phase of the heaviest stars occurs when they crush under their own gravity and form black holes that consume everything near them.
Types of stars
This document describes different stages and types of stars:
- Main sequence stars like our Sun spend most of their lives fusing hydrogen into helium in their cores.
- Red giants are large, reddish stars that have exhausted hydrogen fusion and begun fusing helium.
- Planetary nebulae form when average-sized stars eject their outer layers after becoming red giants, leaving behind dense, hot cores called white dwarfs.
- Brown dwarfs are failed stars too small to sustain nuclear fusion.
- Variable stars change in brightness over timescales from seconds to years as they evolve.
- Binary stars are two gravitationally bound stars that orbit a common center of mass.
The Life Cycle of a Star PowerPoint
Stars are born from clouds of gas and dust called nebulae. Over billions of years, stars progress through various stages as they age. Lower mass stars begin as protostars and become main sequence stars fueled by nuclear fusion. As their hydrogen runs out, they become red giants and eventually white dwarfs. Higher mass stars explode as supernovae at the end of their lives, leaving behind neutron stars or black holes.
Nebulas
See the beauty of these intersteller clouds and how they are created during the birth and death of stars.
Life Cycle Of A Star
The life cycle of a star consists of 5 main stages:
1. Protostars form from huge clouds of gas that collapse under gravity.
2. Main sequence stars like our Sun fuse hydrogen for billions of years.
3. Red giants expand and their outer layers cool as hydrogen runs out.
4. White dwarfs form as red giants collapse under gravity into dense remnants.
5. Black dwarfs are the final remains that cool for eternity, emitting no light.
Life cycle of a star
Stars are born from contracting nebulae of gas and dust. They spend most of their lives on the main sequence, fusing hydrogen into helium in their cores. Eventually they run out of fuel in their cores and their outer layers expand, forming red giants or supergiants. From there, smaller stars shed their outer layers to form planetary nebulae and white dwarfs, while larger stars explode as supernovae, leaving behind neutron stars or black holes.
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Life of stars
The document describes the life cycles of stars from their beginnings as stellar nebulae to their eventual ends as white dwarfs, neutron stars, or black holes. It explains that small stars begin as clouds of dust and gas that collapse under gravity to form stellar nebulae and eventually main sequence stars. As they age, small stars expand into red giants and later planetary nebulae, eventually shrinking down into white dwarfs. More massive stars follow similar stages until reaching their massive ends as red supergiants, supernovae, and neutron stars or black holes.
Planetary nebulae formation
Planetary nebulae form during the late stages of evolution for low-to-medium mass stars. As a star expands into a red giant, it ejects its outer layers through pulsations and stellar winds. The hot core ionizes the ejected gas, causing it to glow brightly. This energized shell of nebulous gas appears as a planetary nebula. Examples are the Helix Nebula and Ring Nebula. More massive stars may explode as supernovae, leaving behind neutron stars or black holes, depending on the star's original mass. The document discusses these stages of stellar evolution and death that give rise to different astronomical phenomena like planetary nebulae and neutron stars.
The life and death of stars
All stars begin as clouds of dust that collapse and form heated cores. As stars reach the end of their lives, they can become white dwarfs after releasing all their energy in the red giant and planetary nebula phases. Alternatively, if a star's internal pressure can no longer counter its own gravity, it may explode as a supernova. The final phase of the heaviest stars occurs when they crush under their own gravity and form black holes that consume everything near them.
Types of stars
This document describes different stages and types of stars:
- Main sequence stars like our Sun spend most of their lives fusing hydrogen into helium in their cores.
- Red giants are large, reddish stars that have exhausted hydrogen fusion and begun fusing helium.
- Planetary nebulae form when average-sized stars eject their outer layers after becoming red giants, leaving behind dense, hot cores called white dwarfs.
- Brown dwarfs are failed stars too small to sustain nuclear fusion.
- Variable stars change in brightness over timescales from seconds to years as they evolve.
- Binary stars are two gravitationally bound stars that orbit a common center of mass.
The Life Cycle of a Star PowerPoint
Stars are born from clouds of gas and dust called nebulae. Over billions of years, stars progress through various stages as they age. Lower mass stars begin as protostars and become main sequence stars fueled by nuclear fusion. As their hydrogen runs out, they become red giants and eventually white dwarfs. Higher mass stars explode as supernovae at the end of their lives, leaving behind neutron stars or black holes.
Nebulas
See the beauty of these intersteller clouds and how they are created during the birth and death of stars.
Life Cycle Of A Star
The life cycle of a star consists of 5 main stages:
1. Protostars form from huge clouds of gas that collapse under gravity.
2. Main sequence stars like our Sun fuse hydrogen for billions of years.
3. Red giants expand and their outer layers cool as hydrogen runs out.
4. White dwarfs form as red giants collapse under gravity into dense remnants.
5. Black dwarfs are the final remains that cool for eternity, emitting no light.
Life cycle of a star
Stars are born from contracting nebulae of gas and dust. They spend most of their lives on the main sequence, fusing hydrogen into helium in their cores. Eventually they run out of fuel in their cores and their outer layers expand, forming red giants or supergiants. From there, smaller stars shed their outer layers to form planetary nebulae and white dwarfs, while larger stars explode as supernovae, leaving behind neutron stars or black holes.
Life Cycle Of A Star
The document discusses the life cycle of stars from their birth in nebulae to their death. Stars are born when gas and dust clouds collapse under gravity and heat up. During their main sequence phase, stars fuse hydrogen into helium in their cores. Later, larger stars become red giants or supergiants as their cores shrink and outer layers expand. Eventually, stars die and eject their outer layers, leaving behind dense remnants like white dwarfs, neutron stars, or black holes.
Stars
'A star is a luminous sphere of plasma held together by its own gravity. The nearest star to Earth is the Sun. Many other stars are visible to the naked eye from Earth during the night, appearing as a multitude of fixed luminous points in the sky due to their immense distance from Earth. Historically, the most prominent stars were grouped into constellations and asterisms, the brightest of which gained proper names. Astronomers have assembled star catalogues that identify the known stars and provide standardised stellar designations. However, most of the stars in the Universe, including all stars outside our galaxy, the Milky Way, are invisible to the naked eye from Earth. Indeed, most are invisible from Earth even through the most powerful telescopes.'
Birth of the star
Stars are formed in nebulae, clouds of dust and gas found in spiral galaxies. Dense parts of these clouds undergo gravitational collapse, compressing to form a rotating gas globule. As the globule collapses over thousands to millions of years due to gravity and pressure, the increasing temperature and rotation cause it to form a central core and surrounding protoplanetary disk. Once the core reaches temperatures over 27 million degrees and nuclear fusion begins, it becomes a stable main sequence star.
Star Life Cycle
Stars are born from clouds of gas and dust called nebulas. As the gas spins faster under gravity, it heats up and forms a protostar. Nuclear fusion then occurs, turning the protostar into a main sequence star that shines for millions of years by fusing hydrogen into helium. Eventually the hydrogen runs out, causing the star to expand into a red giant. From there, less massive stars will blow off their outer layers and collapse into white dwarfs, while more massive stars will explode in supernovas and collapse into neutron stars or black holes.
life cycle of a star
The life cycle of stars depends on their mass. Lower mass stars like our Sun will eventually become red giants then white dwarfs. Higher mass stars live shorter lives and end as supernovas, leaving behind neutron stars or black holes. All stars begin as nebulae of dust and gas that collapse under gravity into protostars and main sequence stars fueled by nuclear fusion.
Life Cycle Of Stars
All stars begin as nebulae of dust and gas that collapse under gravity into protostars. They fuse hydrogen into helium during the main sequence stage, which is the longest phase in a star's life. A star's ultimate fate depends on its mass. Small mass stars become white dwarfs after the main sequence, while medium mass stars become red giants then white dwarfs. Large mass stars over 15 solar masses may explode as supernovae, leaving behind neutron stars or black holes.
Star formation
The document discusses the lifecycle of stars from their formation to death. It begins by defining what stars and constellations are. It then focuses on our sun as a medium-sized, yellow star at the center of our solar system. Stars are classified based on temperature and brightness as young dwarf stars or older, larger supergiant stars. The document outlines the typical stages a star like the sun will progress through over billions of years from birth from clouds of dust and gas, burning hydrogen through nuclear fusion as a main sequence star, and eventual death through expansion and explosion at the end of its life. Various nebulae and supernova remnants are used as examples of star birth and death.
The life cycle of a star
The document outlines the life cycle of stars from birth in nebulae of gas and dust through their main sequence phase, later evolution into red giants, and final stages as white dwarfs, neutron stars, or black holes. It describes how gravity pulls gas together in nebulae to form protostars, which become main sequence stars fueling nuclear fusion for millions of years. As hydrogen runs out in their cores, more massive stars explode as supernovae while lower mass stars expand into red giants then contract into white dwarfs.
Life of stars
Stars are born when a nebula contracts and forms a protostar. Most stars spend about 90% of their lifetime on the main sequence fusing hydrogen into helium. Later in their lives, stars grow into red giants and then supergiants as they fuse heavier elements. When stars die, they expel their outer layers as planetary nebulae, leaving behind dense white dwarfs, neutron stars, or black holes depending on their original mass.
Ch 19 -life and death of stars
1. Stars are born through nuclear fusion and spend most of their life fusing hydrogen into helium as a main sequence star.
2. When stars exhaust their hydrogen fuel, low mass stars become red giants and high mass stars explode as supernovae.
3. The remnants of dead stars are white dwarfs, neutron stars, or black holes depending on the original star's mass.
Star lifecycles poster
High-mass stars have shorter lifespans of 1 million to tens of millions of years compared to low-mass stars like our Sun which live for tens of millions to trillions of years. During their main sequence phase, stars convert about 1/3 of their hydrogen into helium through nuclear fusion. Massive stars are capable of fusing heavier elements like iron. In their later evolution, stars eject their outer layers and collapse their cores, possibly becoming a white dwarf, neutron star, or black hole at the end of their life.
The Life Cycle of a Star
Stars are formed from clouds of gas and dust called nebulae. As stars age and evolve, they progress through different stages - from stars to red giants or dwarfs to supernovae. The most massive stars may collapse into neutron stars or black holes. Black holes are objects so dense that not even light can escape their powerful gravitational pull. Material near a black hole forms a swirling accretion disk and is ejected at nearly light speed in powerful jets. Advancing technology is improving our understanding of stellar evolution and black hole formation.
Life Cycle Ppt.
Stars are formed from dense clouds of gas and dust called nebulas. Over millions of years, the nebula collapses under gravity to form a protostar. Once the protostar's core reaches 10 million K, nuclear fusion begins and the star enters the main sequence stage. During the main sequence, internal pressure balances gravitational forces. Low and medium mass stars end as white dwarfs, then eventually black dwarfs. Massive stars may explode as supernovae, leaving behind neutron stars or black holes.
Galaxies nebulae stars notes
Within galaxies, star forming regions called nebulae contain clouds of dust, hydrogen and helium gases. Stars sometimes form within these nebulae as the gases and dust collapse under their own gravity. A nebula with protostars, or young stars that are still forming, is shown in the diagram. The document then goes on to describe the life cycle of stars like our Sun and the changes it will undergo as it evolves and eventually dies in approximately 5 billion years.
THE LIFE CYCLE OF A STAR!
All stars begin as clouds of dust and gas called nebulae. When gravity causes the nebula to collapse, a protostar forms at the center. The protostar grows in size and temperature through nuclear fusion reactions until it becomes a stable main sequence star. Small stars like our Sun will eventually expand into red giants and shed their outer layers, leaving behind dense white dwarf cores. Larger stars may explode as supernovae, collapsing into neutron stars or black holes. The life cycle of a star depends on its initial mass, with smaller stars ending as white dwarfs and more massive stars ending as black holes or neutron stars.
Life Cycle of Stars
A nebula of dust and gas contracts over 10 million years to form a protostar and eventually a star through nuclear fusion. Stars exist in a main sequence phase fusing hydrogen for billions of years depending on their mass. As hydrogen fusion slows, gravity causes smaller stars to expand into red giants and later white dwarfs, while larger stars become supergiants and eventually explode as supernovae, leaving behind neutron stars or black holes.
The Evolution of a Star
Nebulae consist of gas and dust clouds where stars are born. Stars spend most of their lives on the main sequence, fusing hydrogen into helium in their cores. Eventually they run out of fuel and die, either exploding as supernovae or shedding their outer layers as planetary nebulae. What remains depends on the star's mass - it can become a neutron star, black hole, or white dwarf.
Stellar life cycle section 3
Stellar Life Cycle
1. Stars are born from dense clouds of gas and dust called nebulae.
2. Most stars, including our Sun, spend the majority of their lifespan fusing hydrogen into helium as main sequence stars.
3. Towards the end of their life, stars expand into red giants or supergiants and begin fusing heavier elements, before shrinking into white dwarfs, neutron stars, or black holes.
Star life cycle
Stars form from collapsing clouds of gas and dust found in nebulae. A star's life cycle depends on its mass - smaller stars less than 3 times the Sun's mass will spend most of their existence on the main sequence fusing hydrogen. Larger stars evolve more quickly, becoming red giants and eventually exploding as supernovae, leaving behind neutron stars or black holes.
Life cycle of stars
There are different life cycle stages for stars depending on their original mass. Low mass stars progress through the stages of nebula, main sequence, red giant, planetary nebula, white dwarf, and black dwarf. High mass stars go through nebula, main sequence, red supergiant, supernova, and either become a neutron star or black hole. The main sequence stage can last billions of years for low mass stars but only millions for high mass stars.
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This document summarizes the life cycle of stars from their formation to their death. It begins by explaining how stars are formed from nebulae due to gravity pulling hydrogen gas together. This leads to the main sequence stage where nuclear fusion of hydrogen to helium occurs, powering the star. Eventually stars run out of hydrogen fuel in their cores. Lower mass stars become red giants then white dwarfs. Higher mass stars explode as supernovae, forming neutron stars or black holes. The document also discusses how different elements are synthesized through stellar nucleosynthesis in the cores of stars during their lives and deaths.
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Life Cycle Of A Star
The document discusses the life cycle of stars from their birth in nebulae to their death. Stars are born when gas and dust clouds collapse under gravity and heat up. During their main sequence phase, stars fuse hydrogen into helium in their cores. Later, larger stars become red giants or supergiants as their cores shrink and outer layers expand. Eventually, stars die and eject their outer layers, leaving behind dense remnants like white dwarfs, neutron stars, or black holes.
Stars
'A star is a luminous sphere of plasma held together by its own gravity. The nearest star to Earth is the Sun. Many other stars are visible to the naked eye from Earth during the night, appearing as a multitude of fixed luminous points in the sky due to their immense distance from Earth. Historically, the most prominent stars were grouped into constellations and asterisms, the brightest of which gained proper names. Astronomers have assembled star catalogues that identify the known stars and provide standardised stellar designations. However, most of the stars in the Universe, including all stars outside our galaxy, the Milky Way, are invisible to the naked eye from Earth. Indeed, most are invisible from Earth even through the most powerful telescopes.'
Birth of the star
Stars are formed in nebulae, clouds of dust and gas found in spiral galaxies. Dense parts of these clouds undergo gravitational collapse, compressing to form a rotating gas globule. As the globule collapses over thousands to millions of years due to gravity and pressure, the increasing temperature and rotation cause it to form a central core and surrounding protoplanetary disk. Once the core reaches temperatures over 27 million degrees and nuclear fusion begins, it becomes a stable main sequence star.
Star Life Cycle
Stars are born from clouds of gas and dust called nebulas. As the gas spins faster under gravity, it heats up and forms a protostar. Nuclear fusion then occurs, turning the protostar into a main sequence star that shines for millions of years by fusing hydrogen into helium. Eventually the hydrogen runs out, causing the star to expand into a red giant. From there, less massive stars will blow off their outer layers and collapse into white dwarfs, while more massive stars will explode in supernovas and collapse into neutron stars or black holes.
life cycle of a star
The life cycle of stars depends on their mass. Lower mass stars like our Sun will eventually become red giants then white dwarfs. Higher mass stars live shorter lives and end as supernovas, leaving behind neutron stars or black holes. All stars begin as nebulae of dust and gas that collapse under gravity into protostars and main sequence stars fueled by nuclear fusion.
Life Cycle Of Stars
All stars begin as nebulae of dust and gas that collapse under gravity into protostars. They fuse hydrogen into helium during the main sequence stage, which is the longest phase in a star's life. A star's ultimate fate depends on its mass. Small mass stars become white dwarfs after the main sequence, while medium mass stars become red giants then white dwarfs. Large mass stars over 15 solar masses may explode as supernovae, leaving behind neutron stars or black holes.
Star formation
The document discusses the lifecycle of stars from their formation to death. It begins by defining what stars and constellations are. It then focuses on our sun as a medium-sized, yellow star at the center of our solar system. Stars are classified based on temperature and brightness as young dwarf stars or older, larger supergiant stars. The document outlines the typical stages a star like the sun will progress through over billions of years from birth from clouds of dust and gas, burning hydrogen through nuclear fusion as a main sequence star, and eventual death through expansion and explosion at the end of its life. Various nebulae and supernova remnants are used as examples of star birth and death.
The life cycle of a star
The document outlines the life cycle of stars from birth in nebulae of gas and dust through their main sequence phase, later evolution into red giants, and final stages as white dwarfs, neutron stars, or black holes. It describes how gravity pulls gas together in nebulae to form protostars, which become main sequence stars fueling nuclear fusion for millions of years. As hydrogen runs out in their cores, more massive stars explode as supernovae while lower mass stars expand into red giants then contract into white dwarfs.
Life of stars
Stars are born when a nebula contracts and forms a protostar. Most stars spend about 90% of their lifetime on the main sequence fusing hydrogen into helium. Later in their lives, stars grow into red giants and then supergiants as they fuse heavier elements. When stars die, they expel their outer layers as planetary nebulae, leaving behind dense white dwarfs, neutron stars, or black holes depending on their original mass.
Ch 19 -life and death of stars
1. Stars are born through nuclear fusion and spend most of their life fusing hydrogen into helium as a main sequence star.
2. When stars exhaust their hydrogen fuel, low mass stars become red giants and high mass stars explode as supernovae.
3. The remnants of dead stars are white dwarfs, neutron stars, or black holes depending on the original star's mass.
Star lifecycles poster
High-mass stars have shorter lifespans of 1 million to tens of millions of years compared to low-mass stars like our Sun which live for tens of millions to trillions of years. During their main sequence phase, stars convert about 1/3 of their hydrogen into helium through nuclear fusion. Massive stars are capable of fusing heavier elements like iron. In their later evolution, stars eject their outer layers and collapse their cores, possibly becoming a white dwarf, neutron star, or black hole at the end of their life.
The Life Cycle of a Star
Stars are formed from clouds of gas and dust called nebulae. As stars age and evolve, they progress through different stages - from stars to red giants or dwarfs to supernovae. The most massive stars may collapse into neutron stars or black holes. Black holes are objects so dense that not even light can escape their powerful gravitational pull. Material near a black hole forms a swirling accretion disk and is ejected at nearly light speed in powerful jets. Advancing technology is improving our understanding of stellar evolution and black hole formation.
Life Cycle Ppt.
Stars are formed from dense clouds of gas and dust called nebulas. Over millions of years, the nebula collapses under gravity to form a protostar. Once the protostar's core reaches 10 million K, nuclear fusion begins and the star enters the main sequence stage. During the main sequence, internal pressure balances gravitational forces. Low and medium mass stars end as white dwarfs, then eventually black dwarfs. Massive stars may explode as supernovae, leaving behind neutron stars or black holes.
Galaxies nebulae stars notes
Within galaxies, star forming regions called nebulae contain clouds of dust, hydrogen and helium gases. Stars sometimes form within these nebulae as the gases and dust collapse under their own gravity. A nebula with protostars, or young stars that are still forming, is shown in the diagram. The document then goes on to describe the life cycle of stars like our Sun and the changes it will undergo as it evolves and eventually dies in approximately 5 billion years.
THE LIFE CYCLE OF A STAR!
All stars begin as clouds of dust and gas called nebulae. When gravity causes the nebula to collapse, a protostar forms at the center. The protostar grows in size and temperature through nuclear fusion reactions until it becomes a stable main sequence star. Small stars like our Sun will eventually expand into red giants and shed their outer layers, leaving behind dense white dwarf cores. Larger stars may explode as supernovae, collapsing into neutron stars or black holes. The life cycle of a star depends on its initial mass, with smaller stars ending as white dwarfs and more massive stars ending as black holes or neutron stars.
Life Cycle of Stars
A nebula of dust and gas contracts over 10 million years to form a protostar and eventually a star through nuclear fusion. Stars exist in a main sequence phase fusing hydrogen for billions of years depending on their mass. As hydrogen fusion slows, gravity causes smaller stars to expand into red giants and later white dwarfs, while larger stars become supergiants and eventually explode as supernovae, leaving behind neutron stars or black holes.
The Evolution of a Star
Nebulae consist of gas and dust clouds where stars are born. Stars spend most of their lives on the main sequence, fusing hydrogen into helium in their cores. Eventually they run out of fuel and die, either exploding as supernovae or shedding their outer layers as planetary nebulae. What remains depends on the star's mass - it can become a neutron star, black hole, or white dwarf.
Stellar life cycle section 3
Stellar Life Cycle
1. Stars are born from dense clouds of gas and dust called nebulae.
2. Most stars, including our Sun, spend the majority of their lifespan fusing hydrogen into helium as main sequence stars.
3. Towards the end of their life, stars expand into red giants or supergiants and begin fusing heavier elements, before shrinking into white dwarfs, neutron stars, or black holes.
Star life cycle
Stars form from collapsing clouds of gas and dust found in nebulae. A star's life cycle depends on its mass - smaller stars less than 3 times the Sun's mass will spend most of their existence on the main sequence fusing hydrogen. Larger stars evolve more quickly, becoming red giants and eventually exploding as supernovae, leaving behind neutron stars or black holes.
Life cycle of stars
There are different life cycle stages for stars depending on their original mass. Low mass stars progress through the stages of nebula, main sequence, red giant, planetary nebula, white dwarf, and black dwarf. High mass stars go through nebula, main sequence, red supergiant, supernova, and either become a neutron star or black hole. The main sequence stage can last billions of years for low mass stars but only millions for high mass stars.
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The document summarizes the typical lifecycle of a star in 8 stages:
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5. stars
CAPS Grade 9 Stars module. Covering the life, birth and death of stars. Guided by the unit covered in DocScientia
Astrophysics
Stars are formed from the collapse of giant clouds of dust and gas in space. As the cloud collapses due to gravity, it heats up and eventually nuclear fusion begins in its core, forming a new star. Stars exist in different colors and sizes depending on their mass, with more massive stars being hotter, brighter, and having shorter lifespans than less massive stars. Eventually a star runs out of hydrogen fuel for fusion in its core, causing it to expand into a red giant and later die, leaving behind a white dwarf, neutron star, or black hole depending on its original mass.
L Ife Of A Star
The life cycle of a star begins as a nebula of gas and dust that collapses under gravity into a protostar. Once dense and hot enough, nuclear fusion begins, creating the energy output of a star. Most stars, including our sun, spend the longest part of their life on the main sequence. Eventually stars grow into red giants and later white dwarfs as they run out of fuel. More massive stars may explode as supernovae, leaving behind neutron stars or black holes.
LIFE OF A STAR
Stars are luminous balls of gas held together by gravity. They are formed within dense clouds of dust and gas when disturbances cause fragments to form, with the largest fragments collapsing under their own gravity into protostars. As protostars grow denser and hotter through accretion, nuclear fusion begins, creating a stable star. Stars end their lives differently depending on their size - smaller stars become white dwarfs, medium stars become red giants then white dwarfs, while massive stars undergo violent supernovae, leaving behind neutron stars or black holes.
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Life of stars
- 1. LIFE OF STARS BY: Diana López Barbosa Paula Ibarreta Gallego
- 2. INDEX Stars Hertzsprung-Russell diagram Life cycle of stars Small stars Massive stars Death of stars
- 3. STARS They are massive, luminous balls of hot gas , which are held together by their own gravity. The nearest star to the Earth is the Sun.
- 4. HERTZSPRUNG-RUSSELL DIAGRAM Astronomers can determine the mass, age, chemical composition, and many other properties of a star by observing its motion through space, its luminosity and its temperature.
- 7. SMALL STARS- THE LIFE OF A STAR OF ABOUT ONE SOLAR MASS Stage 1- Stars are born in a region of high density Nebula, and contracts under its own gravity.
- 8. Stage 2 - A region of condensing matter will begin to heat up and start to glow forming Protostars.
- 9. Stage 3 - At this temperature, nuclear reactions in which hydrogen fuses to form helium can start. Stage 4 - The star begins to release energy, stopping it from contracting even more and causes it to shine. .
- 10. ►Stage 5 - A star of one solar mass remains in main sequence for about 10 billion years. ►Stage 6 - The helium core now starts to contract further. Stage 7 - The core is hot enough for the helium to fuse to form carbon.
- 11. Stage 8 - The helium core runs out, and the outer layers drift of away from the core as a gaseous shell, this gas is called a Planetary Nebula. ►Stage 9 - The core becomes a White Dwarf the star eventually cools and dims. When it stops shining, the now dead star is called a Black Dwarf.
- 12. MASSIVE STARS - THE LIFE OF A STAR OF ABOUT 10 SOLAR MASSES Stage 1 - The stars shine steadily until the hydrogen has fused to form helium. Stage 2 - The massive star then becomes a Red Supergiant.
- 13. Stage 4 - The core collapses in less than a second, causing an explosion called a Supernova. ► Stage 5 - Sometimes the core survives the explosion.
- 17. THE END