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Life Cycle of a Star
Transcript of Life Cycle of a Star
The process is quick when a high-mass star becomes a supergiant Life Cycle of a Star Pages: 762-766 A glimpse at the life cycle... Protostar Red Giant White Dwarf Neutron Stars How long a star lives depends on its mass. The blue-white core of the star that is left behind cools and becomes the white dwarf.
They are only about the size of the Earth
They have no fuel, but glow faintly from the leftover energy. Some materiel is left behind after the supergiant explodes
The materiel that is left behind by the supergiant may form a neutron star
They are even smaller and denser than white dwarfs Think about a car...
Small-mass stars use up their fuel more slowly than large-mass stars, so they have much longer lives. What is it called when the white dwarf stops glowing? Supernova Black Holes A black hole is an object with gravity so strong that nothing can escape.
The most massive stars may become black holes when they die. A Star is Born A is a large cloud of gas and dust spread out in a large amount of volume.
A compacting cloud of gas and dust with enough mass to form a star called a A star is born when the compacting gas and dust from a nebula become so dense and hot that nuclear fusion starts. nebula protostar. Proto means "earliest," so protostar is the earliest stage of a star's life. Why do you think the mass of the star is important? High-mass Protostar Use up their fuel slow, so they live longer
Live up to 200 billion years (low-mass)
Live up to 10 billion years (medium-mass)
An example of a medium-mass star is our sun, which is 4.6 billion years old. Low-mass or Medium-mass
Protostar Use up their fuel fast, so they live shorter lives
Live for about 10 million years Death of Stars When a star begins to run out of fuel its core shrinks and its outer portion expands.
Either becoming a a red giant or supergiant
After a star runs out of fuel, it becomes a white dwarf, a neutron, or a black hole. A large cool star (has a red glow), and has a low surface temperature and a large diameter about equal to the suns diameter Supergiant Planetary Nebula Created when a star blows off its outer layers after it has run out of fuel to burn Black Dwarf After billions of years the white dwarf eventually stops glowing, so the stars life ends at the black dwarf. Within hours, the star explodes and becomes a million times brighter, this explosion is called a supernova How long does a supernova last? Main Sequence Stars Once a star, it will continue to burn energy and glow for billions of years.
This star will remain in this condition for the rest of its life and is called the main sequence.