Stars Life Cycle
Life cycle of a star
Stars are born in nebulae. Huge clouds of dust and gas collapse under gravitational forces, forming protostars. These young stars undergo further collapse, forming main sequence stars.
Stars expand as they grow old. As the core runs out of hydrogen and then helium, the core contacts and the outer layers expand, cool, and become less bright. This is a red giant or a red super giant (depending on the initial mass of the star). It will eventually collapse and explode. Its fate is determined by the original mass of the star; it will become either a black dwarf, neutron star, or black hole.
NEBULA -A nebula is a cloud of gas (hydrogen) and dust in space. Nebulae are the birthplaces of stars within the nebula there are varying regions when gravity causes this dust and gas to stick together. …show more content…
STAR -A star is a luminous globe of gas producing its own heat and light by nuclear reactions (nuclear fusion). They are born from nebulae and consist mostly of hydrogen and helium gas. the corresponding colours from red to blue-white.. They live for less than a million years before exploding as supernovae. The faintest stars are the red dwarfs, less than one-thousandth the brightness of the Sun.
RED GIANT-This is a large bright star with a cool surface. It is formed during the later stages of the evolution of a star like the Sun, as it runs out of hydrogen fuel at its centre. They are very bright because they are so large; Very large stars (red giants) are often called Super Giants.
RED DWARF- These are very cool, faint and small stars, They burn very slowly and have estimated lifetimes of 100 billion years. Proxima Centauri and Barnard 's Star are red dwarfs.
WHITE DWARF-This is very small, hot star, the last stage in the life cycle of a star like the Sun. The surface temperature of a white dwarf is 8000C or more, White dwarfs are the shrunken remains of normal stars, whose nuclear energy supplies have been used up. White
SUPERNOVA -This is the explosive death of a star, and often results in the star obtaining the brightness of 100 million suns for a short time. There are two general types of Supernova:-
Type I -These occur in binary star systems in which gas from one star falls on to a white dwarf, causing it to explode.
Type II -These occur in stars ten times or more as massive as the Sun, which suffer runaway internal nuclear reactions at the ends of their lives, leading to an explosion. They leave behind neutron stars and black holes. Supernovae are thought to be main source of elements heavier than hydrogen and helium.
NEUTRON STARS -These stars are composed mainly of neutrons and are produced when a supernova explodes, forcing the protons and electrons to combine to produce a neutron star. Neutron stars are very dense. If its mass is any greater, its gravity will be so strong that it will shrink further to become a black hole.
BLACK HOLES-black holes are believed to form from massive stars at the end of their lifetimes. The gravitational pull in a black hole is so great that nothing can escape from it, not even light. The density of matter in a black hole cannot be measured. Black holes distort the space around them, and can often suck neighbouring matter into them including stars.
nebula star red giant red dwarf white dwarf
supernova neutron stars black hole
Facts:
*A brown dwarf is a protostar that never had enough dust and gas
*The gravitational pull in a black hole is so great that nothing can escape from it, not even light.
* Temperature of a white dwarf is 8000C or more
* A nebula is a cloud of gas (hydrogen) and dust in space
* Stars expand as they grow old
* Very massive stars live at the top of the main sequence, shining very blue and very bright
* So depending on its mass, a star ends its life either in a planetary nebula or supernova
*the star leaves its core behind as a compact object: white dwarf, neutron star, or black hole.
Bibliography:
http://aspire.cosmic-ray.org/labs/star_life/starlife_main.html http://www.telescope.org/pparc/res8.html http://curious.astro.cornell.edu/question.php?number=38
Stars are born in nebulae. Huge clouds of dust and gas collapse under gravitational forces, forming protostars. These young stars undergo further collapse, forming main sequence stars.
Stars expand as they grow old. As the core runs out of hydrogen and then helium, the core contacts and the outer layers expand, cool, and become less bright. This is a red giant or a red super giant (depending on the initial mass of the star). It will eventually collapse and explode. Its fate is determined by the original mass of the star; it will become either a black dwarf, neutron star, or black hole.
NEBULA -A nebula is a cloud of gas (hydrogen) and dust in space. Nebulae are the birthplaces of stars within the nebula there are varying regions when gravity causes this dust and gas to stick together. …show more content…
STAR -A star is a luminous globe of gas producing its own heat and light by nuclear reactions (nuclear fusion). They are born from nebulae and consist mostly of hydrogen and helium gas. the corresponding colours from red to blue-white.. They live for less than a million years before exploding as supernovae. The faintest stars are the red dwarfs, less than one-thousandth the brightness of the Sun.
RED GIANT-This is a large bright star with a cool surface. It is formed during the later stages of the evolution of a star like the Sun, as it runs out of hydrogen fuel at its centre. They are very bright because they are so large; Very large stars (red giants) are often called Super Giants.
RED DWARF- These are very cool, faint and small stars, They burn very slowly and have estimated lifetimes of 100 billion years. Proxima Centauri and Barnard 's Star are red dwarfs.
WHITE DWARF-This is very small, hot star, the last stage in the life cycle of a star like the Sun. The surface temperature of a white dwarf is 8000C or more, White dwarfs are the shrunken remains of normal stars, whose nuclear energy supplies have been used up. White
SUPERNOVA -This is the explosive death of a star, and often results in the star obtaining the brightness of 100 million suns for a short time. There are two general types of Supernova:-
Type I -These occur in binary star systems in which gas from one star falls on to a white dwarf, causing it to explode.
Type II -These occur in stars ten times or more as massive as the Sun, which suffer runaway internal nuclear reactions at the ends of their lives, leading to an explosion. They leave behind neutron stars and black holes. Supernovae are thought to be main source of elements heavier than hydrogen and helium.
NEUTRON STARS -These stars are composed mainly of neutrons and are produced when a supernova explodes, forcing the protons and electrons to combine to produce a neutron star. Neutron stars are very dense. If its mass is any greater, its gravity will be so strong that it will shrink further to become a black hole.
BLACK HOLES-black holes are believed to form from massive stars at the end of their lifetimes. The gravitational pull in a black hole is so great that nothing can escape from it, not even light. The density of matter in a black hole cannot be measured. Black holes distort the space around them, and can often suck neighbouring matter into them including stars.
nebula star red giant red dwarf white dwarf
supernova neutron stars black hole
Facts:
*A brown dwarf is a protostar that never had enough dust and gas
*The gravitational pull in a black hole is so great that nothing can escape from it, not even light.
* Temperature of a white dwarf is 8000C or more
* A nebula is a cloud of gas (hydrogen) and dust in space
* Stars expand as they grow old
* Very massive stars live at the top of the main sequence, shining very blue and very bright
* So depending on its mass, a star ends its life either in a planetary nebula or supernova
*the star leaves its core behind as a compact object: white dwarf, neutron star, or black hole.
Bibliography:
http://aspire.cosmic-ray.org/labs/star_life/starlife_main.html http://www.telescope.org/pparc/res8.html http://curious.astro.cornell.edu/question.php?number=38