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Published byJuliana Watkins Modified over 8 years ago
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Birth, Life and Death of a Star Learning Objective: To learn about the life cycle of a star. Learning Outcomes: All: Will be able to correctly name (C) and simply describe (B)the phases in a life cycle of a star. Most: Will be able to describe the forces in action during the main phases of a stars life cycle (B/A) Some: Will have good knowledge about each section, which will allow them to answer A/A* exam questions with full or near to full marks.
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Video on life of a star
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Birth of a Star All stars start life as a nebula of gas and dust. Over millions of years gravity pulls these closer together.
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Gravitational force Birth of a star Nebula Pressure builds up and the core starts to heat up giving out infra red radiation.
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Birth of a star Protostar Star The gravity eventually gets so big and the temperature gets so high that nuclear fusion starts, it becomes a star The dust and gas from the nebula is added to the protostar, it gains mass. As mass is gained gravity increases and the temperature within the protostar increases
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Life of a star
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Radiation Pressure From the energy of fusion Gravitational force From the mass of the material A Stable Star like our Sun Nuclear fusion 4 Hydrogen 1Helium + ENERGY (Grade A) Nuclear fusion 4 Hydrogen 1Helium + ENERGY (Grade A) The force of the radiation pressure from nuclear fusion is balanced with the gravitational force in a stable star. (Grade B)
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Death of a Star Star like our SunA large Star
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Star Red Giant White dwarf Black Dwarf Eventually a star the size of our sun becomes a Red Giant. The star keeps increasing in size until the gravitational force causes it to collapse into itself creating a White Dwarf This cools down to become a black dwarf.
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Large Star Red Supergiant Supernova Neutron Star Pulsar Black Hole A larger star eventually becomes a super Red Giant. This then collapses, heats up and explodes in a supernova. The small core becomes a neutron star. This can turn into a pulsar If a star is large enough it’ll become a black hole.
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